Why lungs and heart is covered with blood cappilaries

1.	Why lungs and heart is covered with blood cappilaries
Answer» Alveoli are covered with blood capillaries so that the exchange of gases can take place between the membranes of the alveoli and the surrounding capillaries. The\xa0blood capillaries covering alveoli have a low oxygen and high carbon dioxide concentrations. This allows oxygen to diffuse into the blood and carbon dioxide to diffuse out of the blood.

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