The process by which the amount of water and concentration of salts are regulated in the bodies of animals and protozoans. In saltwater environments, water tends to pass from an animal's body through the action of osmosis. This effect is counteracted by the kidneys. Similarly in freshwater environments, the kidneys of higher animals, and the contractile vacuoles of protozoans, prevent water from passing into the body.
Related categories• ANATOMY AND PHYSIOLOGY
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