"Explain why alveoli in the lungs have large surface area and many blood capillaries surrounding them?"
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Answered by
18
Answer:
Alveoli in the lungs have large surface area and many blood capillaries surrounding them because when the alveoli expands, it makes a total surface area of 80m² which makes it very efficient to exchange gases.
And the blood vessels make the absorption of O2 and release of CO2 easier.
Answered by
7
Answer:
The alveoli provides a large surface for the exchange of gases between the blood and the air. Each alveolus is surrounded by many capillaries {tiny blood vessels}. The very thin walls and large surface area of the alveoli and numerous capillaries surrounding them enable gases to be exchanged quickly and effectively.
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