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Capillaries cover the alveoli in order to maximize the area for gas exchange between the lungs and the blood. Carbon dioxide is released from the blood through the capillary walls and into the alveoli, while oxygen is picked up from the alveoli through the capillary walls and into the blood.

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14y ago
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8y ago

The alveoli are tiny sacks in the lungs where the exchange of oxygen and carbon dioxide with the blood occurs. The more capillaries there are the more area of blood is available for the exchange.

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10y ago

because it is good

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Q: Why do capillaries cover the alveoli?
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