Other Free Encyclopedias » 21st Century Webster's Family Encyclopedia » 21st Century Webster's Family Encyclopedia - Black haw to Boulez, Pierre

Bladder

urine

Bladder, muscular sac in the lower abdomen of all mammals that stores urine produced by the kidneys. Urine is carried to the bladder through 2 tubes called ureters and is emptied through the urethra by the contraction of a sphincter muscle. The term is also used to designate any similar organ in plants or animals; for example, the swim bladder in fish and the vesicles in some seaweeds.

See also: Kidney; Urine.

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