Multiple choice

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

  1. Osmosis

  2. Simple diffusion

  3. Passive transport

  4. Active transport
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Gas exchange in the alveoli occurs via simple diffusion, where oxygen moves from an area of higher partial pressure in the alveoli to lower partial pressure in the blood, and carbon dioxide moves in the opposite direction.

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