Q.

Which one of the following organs excretes water, fat and various catabolic wastes?

A. Kidney
B. Skin
C. Spleen
D. Salivary glands
Answer» A. Kidney
Explanation: The kidneys are essential in the urinary system and also serve homeostatic functions such as the regulation of electrolytes, maintenance of acid-base balance, and regulation of blood pressure (via maintaining salt and water balance). They serve the body as a natural filter of the blood, and remove wastes which are diverted to the urinary bladder.
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