What is the role of alveoli in lungs and sweet glands in skin in excretion?
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Alveoli:
* the air sac that is surrounded with capillaries for gas exchange
* is the functional unit for gas exchange
Sweat Glands (Skin)
* water (98%), salts, and a small amount of urea diffuse from the blood into sweat glands
* excreted through the process of perspiration (sweating)
* main job of sweating is to maintain body temperature (cool down)
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