Question

Give reasons for the following:

Alveoli in lungs are richly supplied with blood capillaries.

Answer 1

1. The alveoli in the lungs exchange gases (mainly oxygen and carbon dioxide) between the air and blood.
2. The rich supply of blood capillaries around the alveoli ensures efficient gas exchange.
3. Inhaled oxygen diffuses into the bloodstream through capillaries, whereas carbon dioxide generated during cellular respiration travels to the alveoli for exhalation.
4. The proximity of capillaries to alveoli allows for quick gas exchange, resulting in efficient oxygen absorption and carbon dioxide removal.