排泄囊 excretory bladder
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原肾管向外界的开口部，即在排泄孔近前方所具有的暂时贮存排泄物的囊，也称膀胱。是由表皮下陷而成，在扁形动物中只限于海产的和寄生性的，在轮虫呈节律性收缩，每数十分钟排出与身体总容量相当的水分和排泄物。
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