ProtoplasmJAMA Fundamental material composing all living things. Protoplasm, which exists in all plants and animals
in the small units called cells, is mainly (85% to 90%) water and also contains proteins, fatty substances,
and inorganic salts. It is always enclosed by a thin surface membrane that controls the passage of
materials into and out of the cell. It displays the general properties associated with life--the capacity to
respond to stimuli and the ability to perform the essential physiological functions.
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