Question

Describe how the exchange of gases takes place in the lungs.

Answer 1

Gaseous exchange in lungs:

1. In the lungs, the gaseous exchange occurs through alveoli in the lungs and blood capillaries.
2. The oxygen inhaled through the air in the lungs moves from the alveoli to the blood in the capillaries through the process of diffusion as the oxygen concentration is high in the alveoli and low in the blood capillaries.
3. Similarly, carbon dioxide from the blood capillaries moves to the alveoli in the lungs and is released into the air through exhalation.
4. This occurs because the carbon dioxide concentration is high in the blood capillaries and low in the alveoli.