CONTRACTILE VACUOLE  , in See also:

• BIOLOGY (Gr. Qios, life)

biology, a spherical space filled with liquid, which at intervals discharges into the See also:

• MEDIUM

medium; it is found in all fresh-See also:

• WATER

water See also:

• GROUPS
• GROUPS, THEORY

groups of See also:

• PROTOZOA (Gr. 7rpwros, first, and i'woe, living thing)

Protozoa, and some marine forms, also in the naked aquatic reproductive cells of See also:

• ALGAE

Algae and See also:

• FUNGI (p1. of Lat. fungus, a mushroom)

Fungi . It is absent in states with a distinct See also:

• CELL (from Lat. cella, probably from an Indo-European kal —seen in Lat. celare, to hide; another suggestion connects the word with Lat. cera, wax, taking the original meaning to refer to the honeycomb)

cell-See also:

• WALL (O. Eng. weal, weall, Mid. Eng. wal, wane, adapted from Lat. vallum, rampart; the original O. Eng. word for a wall was wag or tenth)
• WALL, RICHARD (1694-1778)

wall to resist excessive turgescence, such as would See also:

• LEAD
• LEAD (pronounced iced)

lead to the rupture of a naked cell, and we conclude that its See also:

• CHIEF (from Fr. chef, head, Lat. caput)

chief See also:

• FUNCTION

function is to prevent such turgescence in unprotected naked cells . It fulfils also See also:

• RESPIRATORY

respiratory and renal functions, and is comparable, physiologically, to the contractile vesicle or See also:

• BLADDER (from A.S. blaeddre, connected with bl¢wan, to blow, cf. Ger. blase)

bladder of Rotifers and Turbellarians . In many See also:

• SPECIES

species it is See also:

• PART

part of a complex of canals or spaces in the See also:

• PROTOPLASM

protoplasm . See M . Hartog, See also:

• BRITISH

British Association Reports, and Degen, Botanische Zeitung, vol. lxiii . See also:

• ABT, FRANZ (1819-1885)

Abt . I (1905) (see also PROTOZOA; PROTOPLASM) .