膀胱双

**膀胱**是后腹腔的一个不成对的中空器官，当尿液通过尿道排出体外时，它的作用是积聚尿液。尿液是人体的液体分泌物，通过肾脏肾单位的血液过滤而分离出来，主要成分是水。

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Dr. William Whitbourne

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