Question

why do lungs alveoli covered with blood capillaries?

Answer 1

Lungs of alveoli are covered with blood capillaries because blood capillaries have simple squamous epithelium which helps to facilitate easy diffusion of gases through it into the blood which is transported to other organs are cells of the body.
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Answer 2

Answer:

Only two layers of cells thick, the purpose of capillaries is to play the central role in the circulation, delivering oxygen in the blood to the tissues, and picking up carbon dioxide to be eliminated. They are also the place where nutrients are delivered to feed all of the cells of the body.