Which organ exchanges gases with the bloodstream?

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Multiple Choice

Which organ exchanges gases with the bloodstream?

Explanation:
Gas exchange with the bloodstream happens in the lungs, where air reaches tiny air sacs called alveoli surrounded by a network of capillaries. Oxygen from the alveolar air diffuses into the blood, while carbon dioxide moves from the blood into the alveoli to be exhaled. This diffusion-based transfer relies on differences in gas partial pressures and is the primary way the body both takes in oxygen and removes carbon dioxide. The other organs listed—liver, kidneys, and spleen—are involved in metabolism, filtration, and immune functions, but they do not exchange gases with inhaled air.

Gas exchange with the bloodstream happens in the lungs, where air reaches tiny air sacs called alveoli surrounded by a network of capillaries. Oxygen from the alveolar air diffuses into the blood, while carbon dioxide moves from the blood into the alveoli to be exhaled. This diffusion-based transfer relies on differences in gas partial pressures and is the primary way the body both takes in oxygen and removes carbon dioxide. The other organs listed—liver, kidneys, and spleen—are involved in metabolism, filtration, and immune functions, but they do not exchange gases with inhaled air.

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