Male Reproductive System

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  1. bulbourethral gland
    either of two glands that discharge a component of seminal fluid into the urethra; homologous to Bartholin's gland in the female
    The urethra receives secretions from the ejaculatory ducts, the prostate gland, and the bulbourethral glands (accessory glands).
  2. acrosome
    a process at the anterior end of a sperm cell that produces enzymes to facilitate penetration of the egg
    An acrosome at the head tip produces enzymes that help penetrate the female ovum (egg).
  3. seminiferous tubule
    any of the numerous long convoluted tubules in the testis which are the sites where spermatozoa mature
    Each testis contains coiled seminiferous tubules where sperm (male reproductive cells) production occurs.
  4. centriole
    one of a pair of small cylindrical cell organelles near the nucleus in animal cells; composed of nine triplet microtubules and form the asters during mitosis
    Centrioles form the tail, which moves the sperm toward the ovum.
  5. seminiferous
    bearing or producing seed or semen
    Each testis contains coiled seminiferous tubules where sperm (male reproductive cells) production occurs.
  6. ejaculatory duct
    a part of the seminal duct formed by the duct from the seminal vesicle and the vas deferens; passes through the prostate gland
    Each ampulla joins with a seminal vesicle (an accessory gland) to form an ejaculatory duct.
  7. epididymis
    a convoluted tubule in each testis
    The epididymis, a coiled tube next to each testis, receives sperm from the seminiferous tubules.
  8. vas deferens
    a duct that carries spermatozoa from the epididymis to the ejaculatory duct
    The vas deferens is the dilated continuation of the epididymis.
  9. seminal vesicle
    either of a pair of glands located on either side of the male urinary bladder that open into the vas deferens and that secrete many components of semen during ejaculation
    Each ampulla joins with a seminal vesicle (an accessory gland) to form an ejaculatory duct.
  10. sperm
    the male reproductive cell; the male gamete
    Normal sperm production requires the cooler outside temperature.
  11. phospholipid
    any of various compounds composed of fatty acids and phosphoric acid and a nitrogenous base; an important constituent of membranes
    The remainder contains fructose to nourish the sperm, an alkaline component to neutralize vaginal and urethral acidity, and salts and phospholipids, substances that make sperm motile.
  12. urinary bladder
    a membranous sac for temporary retention of urine
    Once in the abdomen, the vas deferens passes behind the urinary bladder and expands to form an ampulla (expanded end part).
  13. innervate
    stimulate to action
    Its walls contain three layers of smooth muscle innervated by sympathetic nerves.
  14. urethra
    duct through which urine is discharged in most mammals and which serves as the male genital duct
    From this junction, the ejaculatory ducts pass through the prostate gland, where they receive more secretions, then join with the single urethra (tube through which sperm and urine pass out of body).
  15. smooth muscle
    a muscle that contracts without conscious control and found in walls of internal organs such as stomach and intestine and bladder and blood vessels (excluding the heart)
    Smooth muscle contractions in the epididymis walls move sperm through the duct.
  16. prostate gland
    a firm partly muscular chestnut sized gland in males at the neck of the urethra; produces a viscid secretion that is the fluid part of semen
    From this junction, the ejaculatory ducts pass through the prostate gland, where they receive more secretions, then join with the single urethra (tube through which sperm and urine pass out of body).
  17. ampulla
    a flask that has two handles
    Once in the abdomen, the vas deferens passes behind the urinary bladder and expands to form an ampulla (expanded end part).
  18. motile
    capable of movement
    Its secretions also help neutralize vaginal acidity and make sperm motile (able to move).
  19. tubule
    a small tube
    Each testis contains coiled seminiferous tubules where sperm (male reproductive cells) production occurs.
  20. engorge
    overeat or eat immodestly; make a pig of oneself
    It contains erectile tissue that becomes engorged with blood during sexual excitement, resulting in an erection.
  21. mitochondrion
    part of a cell involved in energy production
    The middle piece contains mitochondria, structures that provide energy for the sperm.
  22. inguinal canal
    oblique passage through the lower abdominal wall
    The vas deferens travels out of the scrotum and into the abdomen (gut cavity) through the inguinal canal.
  23. duct
    an enclosed conduit for a fluid
    The accessory ducts store secretions from the testes and accessory glands and deliver secretions to the penis.
  24. muscle contraction
    a shortening or tensing of a part or organ
    Smooth muscle contractions in the epididymis walls move sperm through the duct.
  25. penis
    the male organ of copulation (`member' is a euphemism)
    An ejaculation (ejection of sperm from the penis) has 300 to 500 million sperm.
  26. testis
    one of the two male reproductive glands that produce spermatozoa and secrete androgens
    Male reproductive organs

    The testes are paired reproductive organs in the scrotum, which hangs outside the human body.
  27. erectile tissue
    vascular tissue capable of filling with blood and becoming rigid
    It contains erectile tissue that becomes engorged with blood during sexual excitement, resulting in an erection.
  28. vesicle
    a small anatomically normal sac or bladderlike structure
    Each ampulla joins with a seminal vesicle (an accessory gland) to form an ejaculatory duct.
  29. secretion
    the organic process of releasing some substance
    The accessory ducts store secretions from the testes and accessory glands and deliver secretions to the penis.
  30. seminal
    influential and providing a basis for later development
    Each ampulla joins with a seminal vesicle (an accessory gland) to form an ejaculatory duct.
  31. androgen
    male sex hormone that is produced in the testes and responsible for typical male sexual characteristics
    Leydig cells produce androgens (sex hormones), mostly testosterone.
  32. glans
    a small rounded structure
    The penis includes the shaft (tubular portion), glans (penis tip and sexual sensation center), and the prepuce, or foreskin (loose skin fold over glans).
  33. prepuce
    a fold of skin covering the tip of the clitoris
    The penis includes the shaft (tubular portion), glans (penis tip and sexual sensation center), and the prepuce, or foreskin (loose skin fold over glans).
  34. acidity
    the property of being acidic
    These secretions provide energy for the sperm and a neutralizing chemical that reduces vaginal acidity.
  35. urination
    the discharge of urine
    The urethra carries sperm through the penis during intercourse; during urination, urine passes through it.
  36. gland
    a small organ that synthesizes and secretes chemicals
    The accessory ducts store secretions from the testes and accessory glands and deliver secretions to the penis.
  37. reproductive organ
    any organ involved in sexual reproduction
    Male reproductive organs

    The testes are paired reproductive organs in the scrotum, which hangs outside the human body.
  38. vaginal
    of or relating to the vagina
    These secretions provide energy for the sperm and a neutralizing chemical that reduces vaginal acidity.
  39. urinary
    of or relating to the urinary system of the body
    Once in the abdomen, the vas deferens passes behind the urinary bladder and expands to form an ampulla (expanded end part).
  40. prostate
    a firm muscular gland in males at the neck of the urethra
    From this junction, the ejaculatory ducts pass through the prostate gland, where they receive more secretions, then join with the single urethra (tube through which sperm and urine pass out of body).
  41. ovum
    the female reproductive cell; the female gamete
    An acrosome at the head tip produces enzymes that help penetrate the female ovum (egg).
  42. reproductive cell
    a spermatozoon or an ovum
    Each testis contains coiled seminiferous tubules where sperm (male reproductive cells) production occurs.
  43. engorged
    overfull as with blood
    It contains erectile tissue that becomes engorged with blood during sexual excitement, resulting in an erection.
  44. seminal fluid
    the thick white fluid containing spermatozoa that is ejaculated by the male genital tract
    When secretions of these glands combine with sperm, the result is seminal fluid, or semen.
  45. urethral
    of or relating to the urethra
    The remainder contains fructose to nourish the sperm, an alkaline component to neutralize vaginal and urethral acidity, and salts and phospholipids, substances that make sperm motile.
  46. semen
    the thick white fluid containing spermatozoa that is ejaculated by the male genital tract
    When secretions of these glands combine with sperm, the result is seminal fluid, or semen.
  47. fructose
    a simple sugar found in honey and in many ripe fruits
    The remainder contains fructose to nourish the sperm, an alkaline component to neutralize vaginal and urethral acidity, and salts and phospholipids, substances that make sperm motile.
  48. scrotum
    the external pouch that contains the testes
    Male reproductive organs

    The testes are paired reproductive organs in the scrotum, which hangs outside the human body.
  49. secretory
    of or relating to or producing a secretion
    Between the seminiferous tubules are Leydig cells, clusters of endocrine (secretory) cells.
  50. sperm cell
    the male reproductive cell; the male gamete
    Each sperm cell has three parts: a head, middle piece, and tail.
  51. erectile
    capable of being raised to an upright position
    It contains erectile tissue that becomes engorged with blood during sexual excitement, resulting in an erection.
  52. neutralize
    make ineffective by counterbalancing the effect of
    Its secretions also help neutralize vaginal acidity and make sperm motile (able to move).
  53. sphincter
    a ring of muscle that contracts to close an opening
    During ejaculation, a muscular sphincter (ring of muscle) closes off the bladder.
  54. inguinal
    of or relating to or near the groin
    The vas deferens travels out of the scrotum and into the abdomen (gut cavity) through the inguinal canal.
  55. foreskin
    a fold of skin covering the tip of the penis
    The penis includes the shaft (tubular portion), glans (penis tip and sexual sensation center), and the prepuce, or foreskin (loose skin fold over glans).
  56. reproductive
    producing new life or offspring
    Male reproductive organs

    The testes are paired reproductive organs in the scrotum, which hangs outside the human body.
  57. sex hormone
    any hormone affecting the development and growth of sex organs
    Leydig cells produce androgens (sex hormones), mostly testosterone.
  58. contractile
    capable of contracting or being contracted
    The mitochondria are tightly spiraled around the axial filaments (contractile portion) of the flagellum (tail).
  59. urine
    liquid excretory product
    From this junction, the ejaculatory ducts pass through the prostate gland, where they receive more secretions, then join with the single urethra (tube through which sperm and urine pass out of body).
  60. accessory
    a supplementary component that improves capability
    The accessory ducts store secretions from the testes and accessory glands and deliver secretions to the penis.
  61. vas
    a tube in which a body fluid circulates
    The vas deferens is the dilated continuation of the epididymis.
  62. bladder
    a distensible membranous sac
    Once in the abdomen, the vas deferens passes behind the urinary bladder and expands to form an ampulla (expanded end part).
  63. axial
    situated on or along or in the direction of an axis
    The mitochondria are tightly spiraled around the axial filaments (contractile portion) of the flagellum (tail).
  64. chromosome
    a threadlike strand of DNA that carries genes
    During conception, chromosomes (genetic material) in the nucleus (cell control center) join with chromosomes in the ovum.
  65. flagellum
    a lash-like appendage used for locomotion
    The mitochondria are tightly spiraled around the axial filaments (contractile portion) of the flagellum (tail).
  66. control center
    the operational center for a group of related activities
    During conception, chromosomes (genetic material) in the nucleus (cell control center) join with chromosomes in the ovum.
  67. energize
    cause to be alert and active
    The accessory glands produce fluids that nourish and energize the sperm for the journey to the ovum.
  68. close off
    stem the flow of
    During ejaculation, a muscular sphincter (ring of muscle) closes off the bladder.
  69. endocrine
    of or belonging to glands that secrete hormones
    Between the seminiferous tubules are Leydig cells, clusters of endocrine (secretory) cells.
  70. testosterone
    a potent androgenic hormone produced chiefly by the testes
    Leydig cells produce androgens (sex hormones), mostly testosterone.
  71. ejaculation
    the discharge of semen in males
    An ejaculation (ejection of sperm from the penis) has 300 to 500 million sperm.
  72. coiled
    curled or wound in rings or spirals
    Each testis contains coiled seminiferous tubules where sperm (male reproductive cells) production occurs.
  73. ejection
    the act of expelling or projecting
    An ejaculation (ejection of sperm from the penis) has 300 to 500 million sperm.
  74. tubular
    constituting a tube; having hollow tubes
    The penis includes the shaft (tubular portion), glans (penis tip and sexual sensation center), and the prepuce, or foreskin (loose skin fold over glans).
  75. sexual
    of or relating to or characterized by sexuality
    For example, during sexual excitement the seminal vesicles add secretions to the sperm in the ejaculatory duct.
  76. abdomen
    the region of the body between the thorax and the pelvis
    The vas deferens travels out of the scrotum and into the abdomen (gut cavity) through the inguinal canal.
  77. sexual intercourse
    the act of sexual intercourse between two people
    The penis (male sexual organ) deposits semen into the vagina during sexual intercourse and carries urine through the urethra during urination.
  78. paired
    used of gloves, socks, etc.
    Male reproductive organs

    The testes are paired reproductive organs in the scrotum, which hangs outside the human body.
  79. alkaline
    relating to or containing an alkali
    The remainder contains fructose to nourish the sperm, an alkaline component to neutralize vaginal and urethral acidity, and salts and phospholipids, substances that make sperm motile.
  80. vagina
    the lower part of the female reproductive tract
    The penis (male sexual organ) deposits semen into the vagina during sexual intercourse and carries urine through the urethra during urination.
  81. propel
    cause to move forward with force
    The epididymis stores sperm and propels it toward the penis.
  82. dilate
    become wider
    The vas deferens is the dilated continuation of the epididymis.
  83. secrete
    generate and separate from cells or bodily fluids
    The bulbourethral glands secrete a clear fluid that neutralizes the acidity of remaining urine in the urethra.
  84. fluid
    continuous amorphous matter that tends to flow
    The accessory glands produce fluids that nourish and energize the sperm for the journey to the ovum.
  85. circumcision
    the act of circumcising performed on males eight days after birth as a Jewish and Muslim religious rite
    In a circumcision procedure, the prepuce is removed.
  86. enzyme
    a complex protein produced by cells that acts as a catalyst
    An acrosome at the head tip produces enzymes that help penetrate the female ovum (egg).
  87. cell
    the basic structural and functional unit of all organisms
    Each testis contains coiled seminiferous tubules where sperm (male reproductive cells) production occurs.
  88. pass through
    make a passage or journey from one place to another
    As sperm pass through the epididymis, the sperm mature and receive nourishment.
  89. stimulation
    the act of arousing an organism to action
    Stimulation of these nerves propels sperm into the ejaculatory ducts.
  90. filament
    a thin wire heated by the passage of an electric current
    The mitochondria are tightly spiraled around the axial filaments (contractile portion) of the flagellum (tail).
  91. Male
    the capital of Maldives in the center of the islands
    Male reproductive organs

    The testes are paired reproductive organs in the scrotum, which hangs outside the human body.
  92. nourish
    provide with sustenance
    The accessory glands produce fluids that nourish and energize the sperm for the journey to the ovum.
  93. pass out
    give to several people
    From this junction, the ejaculatory ducts pass through the prostate gland, where they receive more secretions, then join with the single urethra (tube through which sperm and urine pass out of body).
  94. coil
    a round shape formed by a series of connected loops
    Each testis contains coiled seminiferous tubules where sperm (male reproductive cells) production occurs.
  95. tail
    the posterior part of the body of a vertebrate especially when elongated and extending beyond the trunk or main part of the body
    Each sperm cell has three parts: a head, middle piece, and tail.
  96. hormone
    the secretion of an endocrine gland transmitted by the blood
    Leydig cells produce androgens (sex hormones), mostly testosterone.
  97. muscle
    animal tissue consisting predominantly of contractile cells
    Smooth muscle contractions in the epididymis walls move sperm through the duct.
  98. genetic
    relating to the study of heredity and variation in organisms
    During conception, chromosomes (genetic material) in the nucleus (cell control center) join with chromosomes in the ovum.
  99. organs
    edible viscera of a butchered animal
    Male reproductive organs

    The testes are paired reproductive organs in the scrotum, which hangs outside the human body.
  100. human body
    alternate name for the body of a human being
    Male reproductive organs

    The testes are paired reproductive organs in the scrotum, which hangs outside the human body.
  101. organ
    a structure in an animal specialized for some function
    Male reproductive organs

    The testes are paired reproductive organs in the scrotum, which hangs outside the human body.
  102. cooler
    a refrigerator for cooling liquids
    Normal sperm production requires the cooler outside temperature.
  103. contraction
    the act of decreasing in size or volume or quantity or scope
    Smooth muscle contractions in the epididymis walls move sperm through the duct.
  104. nourishment
    the act of providing with food or nutrients
    As sperm pass through the epididymis, the sperm mature and receive nourishment.
  105. nucleus
    a part of the cell responsible for growth and reproduction
    During conception, chromosomes (genetic material) in the nucleus (cell control center) join with chromosomes in the ovum.
  106. contain
    hold or have within
    Each testis contains coiled seminiferous tubules where sperm (male reproductive cells) production occurs.
  107. erection
    the act of building or putting up
    It contains erectile tissue that becomes engorged with blood during sexual excitement, resulting in an erection.
  108. continuation
    the act of carrying on with an activity without interruption
    The vas deferens is the dilated continuation of the epididymis.
  109. intercourse
    the act of engaging in sexual intercourse
    The urethra carries sperm through the penis during intercourse; during urination, urine passes through it.
  110. component
    one of the individual parts making up a larger entity
    The remainder contains fructose to nourish the sperm, an alkaline component to neutralize vaginal and urethral acidity, and salts and phospholipids, substances that make sperm motile.
  111. nerves
    control of your emotions
    Its walls contain three layers of smooth muscle innervated by sympathetic nerves.
  112. tube
    a hollow cylindrical shape
    The epididymis, a coiled tube next to each testis, receives sperm from the seminiferous tubules.
  113. gut
    the part of the alimentary canal between the stomach and the anus
    The vas deferens travels out of the scrotum and into the abdomen (gut cavity) through the inguinal canal.
  114. spiral
    something wound in a continuous series of loops
    The mitochondria are tightly spiraled around the axial filaments (contractile portion) of the flagellum (tail).
  115. receive
    get something; come into possession of
    The epididymis, a coiled tube next to each testis, receives sperm from the seminiferous tubules.
  116. cavity
    a space that is enclosed or surrounded by something
    The vas deferens travels out of the scrotum and into the abdomen (gut cavity) through the inguinal canal.
  117. pass
    go across or through
    As sperm pass through the epididymis, the sperm mature and receive nourishment.
  118. expand
    extend in one or more directions
    Once in the abdomen, the vas deferens passes behind the urinary bladder and expands to form an ampulla (expanded end part).
  119. tip
    the extreme end of something, especially something pointed
    An acrosome at the head tip produces enzymes that help penetrate the female ovum (egg).
  120. percent
    a proportion in relation to a whole
    Only 1 percent of semen is sperm.
  121. muscular
    having a robust body-build
    During ejaculation, a muscular sphincter (ring of muscle) closes off the bladder.
  122. produce
    bring forth or yield
    Leydig cells produce androgens (sex hormones), mostly testosterone.
  123. junction
    an act of joining or adjoining things
    From this junction, the ejaculatory ducts pass through the prostate gland, where they receive more secretions, then join with the single urethra (tube through which sperm and urine pass out of body).
  124. mature
    having reached full natural growth or development
    As sperm pass through the epididymis, the sperm mature and receive nourishment.
  125. expanded
    increased in extent or size or bulk or scope
    Once in the abdomen, the vas deferens passes behind the urinary bladder and expands to form an ampulla (expanded end part).
  126. nerve
    a bundle of fibers running to organs and tissues of the body
    Its walls contain three layers of smooth muscle innervated by sympathetic nerves.
  127. execute
    put in effect
    The urethra cannot execute both functions simultaneously.
  128. through
    having finished or arrived at completion
    Smooth muscle contractions in the epididymis walls move sperm through the duct.
  129. penetrate
    pass into or through, often by overcoming resistance
    An acrosome at the head tip produces enzymes that help penetrate the female ovum (egg).
  130. store
    a mercantile establishment for the sale of goods or services
    The accessory ducts store secretions from the testes and accessory glands and deliver secretions to the penis.
  131. smooth
    having a surface free from roughness or irregularities
    Smooth muscle contractions in the epididymis walls move sperm through the duct.
  132. simultaneously
    at the same instant
    The urethra cannot execute both functions simultaneously.
  133. male
    being the sex that performs the fertilizing function
    Each testis contains coiled seminiferous tubules where sperm (male reproductive cells) production occurs.
  134. combine
    put or add together
    When secretions of these glands combine with sperm, the result is seminal fluid, or semen.
  135. excitement
    the state of being emotionally worked up
    For example, during sexual excitement the seminal vesicles add secretions to the sperm in the ejaculatory duct.
  136. tightly
    in a tight or constricted manner
    The mitochondria are tightly spiraled around the axial filaments (contractile portion) of the flagellum (tail).
  137. provide
    give something useful or necessary to
    The middle piece contains mitochondria, structures that provide energy for the sperm.
  138. procedure
    a particular course of action intended to achieve a result
    In a circumcision procedure, the prepuce is removed.
  139. tissue
    part of an organism consisting of an aggregate of cells
    It contains erectile tissue that becomes engorged with blood during sexual excitement, resulting in an erection.
  140. layer
    a single thickness of some substance or material
    Its walls contain three layers of smooth muscle innervated by sympathetic nerves.
  141. sympathetic
    expressing compassion or friendly fellow feelings
    Its walls contain three layers of smooth muscle innervated by sympathetic nerves.
  142. join
    cause to become joined or linked
    During conception, chromosomes (genetic material) in the nucleus (cell control center) join with chromosomes in the ovum.
  143. carrier
    a person or firm transporting people or goods or messages
    The vas deferens is the main sperm carrier.
  144. cluster
    a grouping of a number of similar things
    Between the seminiferous tubules are Leydig cells, clusters of endocrine (secretory) cells.
  145. production
    the act or process of making something
    Normal sperm production requires the cooler outside temperature.
  146. center
    an area that is in the middle of some larger region
    During conception, chromosomes (genetic material) in the nucleus (cell control center) join with chromosomes in the ovum.
  147. energy
    forceful exertion
    The middle piece contains mitochondria, structures that provide energy for the sperm.
  148. portion
    something determined in relation to a thing that includes it
    The mitochondria are tightly spiraled around the axial filaments (contractile portion) of the flagellum (tail).
  149. remainder
    something left after other parts have been taken away
    The remainder contains fructose to nourish the sperm, an alkaline component to neutralize vaginal and urethral acidity, and salts and phospholipids, substances that make sperm motile.
  150. shaft
    a long rod or pole, especially the body of a weapon
    The penis includes the shaft (tubular portion), glans (penis tip and sexual sensation center), and the prepuce, or foreskin (loose skin fold over glans).
  151. reduce
    make smaller
    These secretions provide energy for the sperm and a neutralizing chemical that reduces vaginal acidity.
  152. chemical
    produced by reactions involving atomic or molecular changes
    These secretions provide energy for the sperm and a neutralizing chemical that reduces vaginal acidity.
  153. temperature
    the degree of hotness or coldness of a body or environment
    Normal sperm production requires the cooler outside temperature.
  154. canal
    long and narrow strip of water for boats or for irrigation
    The vas deferens travels out of the scrotum and into the abdomen (gut cavity) through the inguinal canal.
  155. deliver
    bring to a destination
    The accessory ducts store secretions from the testes and accessory glands and deliver secretions to the penis.
  156. deposit
    the act of putting something somewhere
    The penis (male sexual organ) deposits semen into the vagina during sexual intercourse and carries urine through the urethra during urination.
  157. parts
    the local environment
    Each sperm cell has three parts: a head, middle piece, and tail.
  158. normal
    being approximately average or within certain limits
    Normal sperm production requires the cooler outside temperature.
  159. outside
    the region that is outside of something
    Male reproductive organs

    The testes are paired reproductive organs in the scrotum, which hangs outside the human body.
  160. middle
    an area that is approximately central within some larger region
    Each sperm cell has three parts: a head, middle piece, and tail.
  161. sensation
    an awareness of some type of stimulation
    The penis includes the shaft (tubular portion), glans (penis tip and sexual sensation center), and the prepuce, or foreskin (loose skin fold over glans).
  162. each
    separately for every person or thing
    Each testis contains coiled seminiferous tubules where sperm (male reproductive cells) production occurs.
  163. conception
    the creation of something in the mind
    During conception, chromosomes (genetic material) in the nucleus (cell control center) join with chromosomes in the ovum.
  164. remove
    take something away as by lifting, pushing, or taking off
    In a circumcision procedure, the prepuce is removed.
  165. move
    change location
    Centrioles form the tail, which moves the sperm toward the ovum.
  166. body
    an individual 3-dimensional object that has mass
    Male reproductive organs

    The testes are paired reproductive organs in the scrotum, which hangs outside the human body.
  167. function
    what something is used for
    The urethra cannot execute both functions simultaneously.
  168. structure
    a complex entity made of many parts
    The middle piece contains mitochondria, structures that provide energy for the sperm.
  169. 300
    being one hundred more than two hundred
    An ejaculation (ejection of sperm from the penis) has 300 to 500 million sperm.
  170. mostly
    in large part; mainly or chiefly
    Leydig cells produce androgens (sex hormones), mostly testosterone.
  171. remaining
    not used up
    The bulbourethral glands secrete a clear fluid that neutralizes the acidity of remaining urine in the urethra.
  172. substance
    the real physical matter of which a person or thing consists
    The remainder contains fructose to nourish the sperm, an alkaline component to neutralize vaginal and urethral acidity, and salts and phospholipids, substances that make sperm motile.
  173. part
    one of the portions into which something is regarded as divided and which together constitute a whole
    Each sperm cell has three parts: a head, middle piece, and tail.
  174. for example
    as an example
    For example, during sexual excitement the seminal vesicles add secretions to the sperm in the ejaculatory duct.
  175. fold
    bend or lay so that one part covers the other
    The penis includes the shaft (tubular portion), glans (penis tip and sexual sensation center), and the prepuce, or foreskin (loose skin fold over glans).
  176. ring
    a toroidal shape
    During ejaculation, a muscular sphincter (ring of muscle) closes off the bladder.
  177. piece
    a separate part of a whole
    Each sperm cell has three parts: a head, middle piece, and tail.
  178. loose
    not affixed
    The penis includes the shaft (tubular portion), glans (penis tip and sexual sensation center), and the prepuce, or foreskin (loose skin fold over glans).
  179. include
    have as a part; be made up out of
    The penis includes the shaft (tubular portion), glans (penis tip and sexual sensation center), and the prepuce, or foreskin (loose skin fold over glans).
  180. form
    a perceptual structure
    Centrioles form the tail, which moves the sperm toward the ovum.
  181. result
    something that follows as a consequence
    When secretions of these glands combine with sperm, the result is seminal fluid, or semen.
  182. wall
    an architectural partition with a height and length greater than its thickness; used to divide or enclose an area or to support another structure
    Smooth muscle contractions in the epididymis walls move sperm through the duct.
  183. sex
    one of two categories into which most organisms are divided
    Leydig cells produce androgens (sex hormones), mostly testosterone.
  184. removed
    separate or apart in time, space, or character
    In a circumcision procedure, the prepuce is removed.
  185. salt
    white crystalline form of especially sodium chloride used to season and preserve food
    The remainder contains fructose to nourish the sperm, an alkaline component to neutralize vaginal and urethral acidity, and salts and phospholipids, substances that make sperm motile.
  186. egg
    animal reproductive body consisting of an ovum or embryo together with nutritive and protective envelopes; especially the thin-shelled reproductive body laid by e.g. female birds
    An acrosome at the head tip produces enzymes that help penetrate the female ovum (egg).
  187. female
    of the sex that produces eggs from which offspring develop
    An acrosome at the head tip produces enzymes that help penetrate the female ovum (egg).
  188. section
    one of several parts or pieces that fit with others
    The urethra is the final section of the duct system.
  189. 500
    the cardinal number that is the product of one hundred and five
    An ejaculation (ejection of sperm from the penis) has 300 to 500 million sperm.
  190. pair
    a set of two similar things considered as a unit
    Male reproductive organs

    The testes are paired reproductive organs in the scrotum, which hangs outside the human body.
  191. require
    have need of
    Normal sperm production requires the cooler outside temperature.
  192. final
    an exam administered at the end of an academic term
    The urethra is the final section of the duct system.
  193. head
    the upper part of the human body or the body in animals
    Each sperm cell has three parts: a head, middle piece, and tail.
  194. skin
    a natural protective body covering and site of the sense of touch
    The penis includes the shaft (tubular portion), glans (penis tip and sexual sensation center), and the prepuce, or foreskin (loose skin fold over glans).
  195. carry
    physically move while supporting, by vehicle, hands, or body
    The urethra carries sperm through the penis during intercourse; during urination, urine passes through it.
  196. three
    the cardinal number that is the sum of one and one and one
    Each sperm cell has three parts: a head, middle piece, and tail.
  197. surround
    extend on all sides of simultaneously; encircle
    The prostate gland lies under the urinary bladder and surrounds the first part of the urethra.
  198. help
    give assistance; be of service
    An acrosome at the head tip produces enzymes that help penetrate the female ovum (egg).
  199. add
    join or combine or unite with others
    For example, during sexual excitement the seminal vesicles add secretions to the sperm in the ejaculatory duct.
  200. journey
    the act of traveling from one place to another
    The accessory glands produce fluids that nourish and energize the sperm for the journey to the ovum.
  201. main
    most important element
    The vas deferens is the main sperm carrier.
  202. material
    the substance that goes into the makeup of a physical object
    During conception, chromosomes (genetic material) in the nucleus (cell control center) join with chromosomes in the ovum.
  203. occur
    come to pass
    Each testis contains coiled seminiferous tubules where sperm (male reproductive cells) production occurs.
  204. travel
    change location
    The vas deferens travels out of the scrotum and into the abdomen (gut cavity) through the inguinal canal.
  205. example
    an item of information that is typical of a class or group
    For example, during sexual excitement the seminal vesicles add secretions to the sperm in the ejaculatory duct.
  206. end
    either extremity of something that has length
    Once in the abdomen, the vas deferens passes behind the urinary bladder and expands to form an ampulla (expanded end part).
  207. single
    existing alone or consisting of one entity or part or aspect or individual
    From this junction, the ejaculatory ducts pass through the prostate gland, where they receive more secretions, then join with the single urethra (tube through which sperm and urine pass out of body).
  208. control
    power to direct or determine
    During conception, chromosomes (genetic material) in the nucleus (cell control center) join with chromosomes in the ovum.
  209. out of
    motivated by
    The vas deferens travels out of the scrotum and into the abdomen (gut cavity) through the inguinal canal.
  210. hang
    cause to be hanging or suspended
    Male reproductive organs

    The testes are paired reproductive organs in the scrotum, which hangs outside the human body.
  211. Here
    queen of the Olympian gods in ancient Greek mythology
    Here, the ampulla of the vas deferens and seminal vesicles meet and secretions from the seminal vesicles and sperm are stored.
  212. system
    a group of independent elements comprising a unified whole
    The urethra is the final section of the duct system.
  213. blood
    the fluid that is pumped through the body by the heart
    It contains erectile tissue that becomes engorged with blood during sexual excitement, resulting in an erection.
  214. million
    the number that is represented as a one followed by 6 zeros
    An ejaculation (ejection of sperm from the penis) has 300 to 500 million sperm.
Created on Wed Jun 09 11:43:33 EDT 2010

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