Q. Gas exchange first occurs in?
Solution:
- The answer is A. Gas exchange first occurs in the lungs.
- The lungs are the main organs of the respiratory system and are responsible for gas exchange between the blood and the air. The lungs contain millions of tiny air sacs called alveoli. The alveoli are surrounded by a network of capillaries, which are tiny blood vessels.
- When we inhale, oxygen from the air enters the alveoli. The oxygen then diffuses across the thin walls of the alveoli and into the capillaries. At the same time, carbon dioxide diffuses from the capillaries into the alveoli.
- When we exhale, the carbon dioxide in the alveoli is released into the air. The oxygen in the capillaries then diffuses into the tissues of the body.
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