Biology: The Unity and Diversity of Life (14th Edition)

Published by Brooks/Cole Publishing Co.
ISBN 10: 1305073959
ISBN 13: 978-1-30507-395-1

Chapter 21 - Self-Quiz - Page 353: 11


d. lives in fresh water

Work Step by Step

Protists that live in fresh water need contractile vacuoles to pump water out of them. The contractile vacuole usually contains water, releasing water into the cell if needed; however, if there is too much water already inside the cell, the contractile vacuole will release water to the outside environment. If a protist cell contains too much water, it will burst, so the contractile vacuole has the important function of keeping water at an equilibrium level inside the protist.
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