Q126 / 160 · JIPMER 2011 · Zoology

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

  • A
    osmosis
  • Correct answer
    B
    simple diffusion
  • C
    passive transport
  • D
    active transport

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.

Hence, the correct answer is option: 'B'.

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