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vacuole (vak´yu-ol)

1. A minute space in any tissue. 2. A clear space in the substance of a cell, sometimes degenerative in character, sometimes surrounding an englobed foreign body and serving as a temporary cell stomach for the digestion of the body. [Mod. L. vacuolum, dim. of L. vacuum, an empty space]
autophagic v. cytolysosome
contractile v. a cavity formed by the accumulation of fluid in the ectoplasm of a protozoan; after increasing for a time it empties itself externally by a sudden contraction; it functions as an osmoregulatory mechanism for water balance, especially in freshwater protozoans.
digestive v. secondary lysosomes, under lysosome
parasitophorous v. a v. formed by layers of endoplasmic reticulum around an intracellular parasite which may serve to isolate the parasite and enclose it for lysozymal attack.


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