physiological reaction

/ˌˈfɪziəˌlɑdʒəkəl riˌækʃən/

Other forms: physiological reactions

Definitions of physiological reaction
  1. noun
    an automatic instinctive unlearned reaction to a stimulus
    synonyms: inborn reflex, innate reflex, instinctive reflex, reflex, reflex action, reflex response, unconditioned reflex
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    accommodation reflex
    reflex changes in the eyes that enable an object to be focused on the retina
    Babinski, Babinski reflex, Babinski sign
    extension upward of the toes when the sole of the foot is stroked firmly on the outer side from the heel to the front; normal in infants under the age of two years but a sign of brain or spinal cord injury in older persons
    belch, belching, burp, burping, eructation
    a reflex that expels gas noisily from the stomach through the mouth
    blink, blinking, eye blink, nictation, nictitation, wink, winking
    a reflex that closes and opens the eyes rapidly
    blush, flush
    sudden reddening of the face (as from embarrassment or guilt or shame or modesty)
    disgorgement, emesis, regurgitation, vomit, vomiting
    the reflex act of ejecting the contents of the stomach through the mouth
    defecation reflex, rectal reflex
    normal response to the presence of feces in the rectum
    oscitance, oscitancy, yawn, yawning
    an involuntary intake of breath through a wide open mouth; usually triggered by fatigue or boredom
    electric shock, electrical shock, shock
    a reflex response to the passage of electric current through the body
    gulp, gulping
    a spasmodic reflex of the throat made as if in swallowing
    knee jerk, knee-jerk reflex, patellar reflex
    a reflex extension of the leg resulting from a sharp tap on the patellar tendon
    light reflex, miosis, myosis, pupillary reflex
    reflex contraction of the sphincter muscle of the iris in response to a bright light (or certain drugs) causing the pupil to become smaller
    reflex pupillary dilation as a muscle pulls the iris outward; occurs in response to a decrease in light or certain drugs
    micturition reflex
    relaxation of the urethral sphincter in response to increased pressure in the bladder
    gag reflex, pharyngeal reflex
    normal reflex consisting of retching; may be produced by touching the soft palate in the back of the mouth
    goose bump, goose pimple, goose skin, goosebump, gooseflesh, horripilation, pilomotor reflex
    reflex erection of hairs of the skin in response to cold or emotional stress or skin irritation
    plantar reflex
    flexion of the toes when the sole of the foot is stroked firmly on the outer side from the heel to the front in persons over the age of 2 years; under 2 years the results should be extension of the toes (Babinski reflex)
    rooting reflex
    reflex consisting of head-turning and sucking movements elicited in a normal infant by gently stroking the side of the mouth or cheek
    jump, start, startle
    a sudden involuntary movement
    myotactic reflex, stretch reflex
    reflex contraction of a muscle when an attached tendon is pulled; important in maintaining erect posture
    suckling reflex
    reflex behavior in newborn mammals; includes finding and grasping the nipple in the mouth and sucking on it and swallowing the milk
    shake, shiver, tremble
    a reflex motion caused by cold or fear or excitement
    sneeze, sneezing, sternutation
    a symptom consisting of the involuntary expulsion of air from the nose
    hiccough, hiccup, singultus
    (usually plural) the state of having reflex spasms of the diaphragm accompanied by a rapid closure of the glottis producing an audible sound; sometimes a symptom of indigestion
    regurgitation of small amounts of food; seen in some infants after feeding
    haematemesis, hematemesis
    vomiting blood
    severe and excessive vomiting
    yawning and stretching (as when first waking up)
    startle reaction, startle response
    a complicated involuntary reaction to a sudden unexpected stimulus (especially a loud noise); involves flexion of most skeletal muscles and a variety of visceral reactions
    Moro reflex, startle reflex
    a normal reflex of young infants; a sudden loud noise causes the child to stretch out the arms and flex the legs
    flinch, wince
    a reflex response to sudden pain
    repeated blinking or winking (especially if uncontrolled and persistent)
    type of:
    reaction, response
    a bodily process occurring due to the effect of some antecedent stimulus or agent
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