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In humans, gas exchange occurs in which part of the lungs?

Answer and explanation

Correct answer: Alveoli

Human lungs contain millions of tiny air sacs called alveoli. Each alveolus has a moist, very thin wall and is surrounded by a network of blood capillaries. Oxygen diffuses from the inhaled air into the blood, while carbon dioxide diffuses in the opposite direction. Thus option A is correct; the stomach and small intestine digest or absorb food, and the kidney filters blood.

Related tags

AlveoliLungsGas-ExchangeLife ProcessesWorld Of LivingScienceClass 10 Mcq

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