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The exchange of gases in the alveoli of the lungs takes place by

1. (a) simple diffusion
2. (b) osmosis
3. (c) active transport
4. (d) passive transport

Correct answer: (a) simple diffusion

Solution

In the alveoli, oxygen and carbon dioxide move from higher to lower concentration across the alveolar-capillary membrane. This is simple diffusion, not osmosis or active transport.

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