Q166 / 200 · NEET 2011 (Screening) · Zoology

The figure given below shows a small part of human lung where exchange of gas takes place. In which one of the options given below, the one part A, B C or D is correctly identified along with its function. Figure

  • Correct answer
    A
    A - Alveolar cavity - main site of exchange of respiratory gases
  • B
    D - Capillary wall - exchange of and takes place here
  • C
    B - Red blood cell - transport of mainly
  • D
    C - Arterial capillary - passes oxygen to tissues

Solution

Alveoli are the primary sites of exchange of gases. The exchange of gases $\left(\mathrm{O}_2\right.$ and $\left.\mathrm{CO}_2\right)$ between the alveoli and the blood occurs by simple diffusion.

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

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