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NEET2011ZoologyBreathing and Exchange of GasesActual

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

Options

  1. Aosmosis
  2. Bsimple diffusion
  3. Cpassive transport
  4. Dactive transport

Correct answer

B. simple diffusion

Step-by-step solution

Oxygen diffuses from alveoli to deoxygenated blood, and carbon dioxide diffuses from deoxygenated blood to alveoli by simple diffusion. Diffusion is defined as, the flow of the substance (gases) from a region of their higher concentration to a region of lower concentration.

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