Question 9:
How are the alveoli designed to maximise the exchange of gases?
Answer
The alveoli are the small balloon-like structures present in the lungs. The walls of
the alveoli consist of extensive network of blood vessels. Each lung contains
300−350 million alveoli, making it a total of approximately 700 million in both the
lungs. The alveolar surface when spread out covers about 80 m2 area. This large
surface area makes the gaseous exchange more efficient.
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