Cell Structure

thomas S.
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  1. anterior horn
    one of two the two roots of a spinal nerve that passes ventrally from the spinal cord and that consists of motor fibers
    The longest human cells are about 135 µm in the anterior horn in the spinal cord while granule cells in the cerebellum, the smallest, can be some 4 µm and the longest cell can reach from the toe to the lower brain stem (Pseudounipolar cells).[2]
  2. cell theory
    (biology) the theory that cells form the fundamental structural and functional units of all living organisms; proposed in 1838 by Matthias Schleiden and by Theodor Schwann
    In 1835, before the final cell theory was developed, Jan Evangelista Purkyně observed small "granules" while looking at the plant tissue through a microscope.
  3. granule
    a tiny particle of something
    The longest human cells are about 135 µm in the anterior horn in the spinal cord while granule cells in the cerebellum, the smallest, can be some 4 µm and the longest cell can reach from the toe to the lower brain stem (Pseudounipolar cells).[2]
  4. multicellular
    consisting of many basic structural and functional units
    Other organisms, such as humans, are multicellular.
  5. unicellular
    having a single basic functional unit, of an organism
    Some organisms, such as most bacteria, are unicellular (consist of a single cell).
  6. cerebellum
    a major division of the vertebrate brain
    The longest human cells are about 135 µm in the anterior horn in the spinal cord while granule cells in the cerebellum, the smallest, can be some 4 µm and the longest cell can reach from the toe to the lower brain stem (Pseudounipolar cells).[2]
  7. organism
    a living thing that can act or function independently
    It was discovered by Robert Hooke and is the functional unit of all known living organisms.
  8. functional
    designed for or capable of a particular use
    The cell is the functional basic unit of life.
  9. function
    what something is used for
    The cell theory, first developed in 1839 by Matthias Jakob Schleiden and Theodor Schwann, states that all organisms are composed of one or more cells, that all cells come from preexisting cells, that vital functions of an organism occur within cells, and that all cells contain the hereditary information necessary for regulating cell functions and for transmitting information to the next generation of cells.[5]
  10. typical
    exhibiting the qualities that identify a group or kind
    Humans have about 100 trillion or 1014 cells; a typical cell size is 10 µm and a typical cell mass is 1 nanogram.
Created on Thu Sep 29 21:29:41 EDT 2011

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