Which organs are the sites of gas exchange where oxygen enters the blood and carbon dioxide is released?

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Multiple Choice

Which organs are the sites of gas exchange where oxygen enters the blood and carbon dioxide is released?

Explanation:
Gas exchange happens where the air meets the blood, inside the lungs at the tiny air sacs called alveoli. Oxygen from inhaled air diffuses through the thin alveolar walls into surrounding capillaries, while carbon dioxide diffuses from the blood into the alveoli to be exhaled. This relies on partial pressure differences and a very thin, moist respiratory membrane with a large surface area supplied by a dense capillary network. The other structures are airways that move air but do not perform gas exchange: they conduct air to and from the lungs. So, the organs where gas exchange occurs are the lungs.

Gas exchange happens where the air meets the blood, inside the lungs at the tiny air sacs called alveoli. Oxygen from inhaled air diffuses through the thin alveolar walls into surrounding capillaries, while carbon dioxide diffuses from the blood into the alveoli to be exhaled. This relies on partial pressure differences and a very thin, moist respiratory membrane with a large surface area supplied by a dense capillary network. The other structures are airways that move air but do not perform gas exchange: they conduct air to and from the lungs. So, the organs where gas exchange occurs are the lungs.

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