淡水海绵湖海绵（Spongilla lacustris）细胞中的伸缩泡。
Contractile vacuoles in cells of a fresh water sponge, Spongilla lacustris.
作者信息
Brauer E B, McKanna J A
出版信息
Cell Tissue Res. 1978 Sep 5;192(2):309-17. doi: 10.1007/BF00220748.
Forty or more independently functioning contractile vacuoles (CVs) occupy the central region of fresh water sponge pinacocytes. Eash CV undergoes a cycle of enlargement by fusion, movement, shape change, rounding up, and emptying over the course of 5--30 min. Diameter at discharge varies between 1 and 13 micron. CVs in all cell types are associated with submicroscopic coated vesicles. Filled CVs are bounded by an unmodified trilaminar membrane, but vacuoles with excess membrane frequently show coated evaginations. These evaginations are thought to pinch off as coated vesicles, providing an avenue for membrane recycling in the CV system.
四十个或更多独立发挥作用的收缩泡（CVs）占据淡水海绵扁平细胞的中央区域。每个收缩泡在5 - 30分钟的过程中经历融合、移动、形状改变、变圆和排空的扩大循环。排出时的直径在1至13微米之间变化。所有细胞类型中的收缩泡都与亚显微被膜小泡相关。充满的收缩泡由未修饰的三层膜界定，但具有多余膜的液泡经常显示出被膜外翻。这些外翻被认为会作为被膜小泡 pinched off，为收缩泡系统中的膜循环提供了一条途径。 （注：pinched off 这里原文有误，应该是pinch off，意为“掐断、脱离” ，准确译文：这些外翻被认为会作为被膜小泡脱离，为收缩泡系统中的膜循环提供了一条途径。）
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