Question

Why are lung alveoli covered with blood capillaries?? PLEASE HELP ASAP ITS DUE TODAY

Answer 1

Hey mate
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Alveoli covered with blood capillaries so that the exchange of gases can take place between the membranes of the alveoli and the surrounding capillaries. The blood capillariescovering alveoli have a low oxygen and high carbon dioxide concentrations.
Hope this helps u

Answer 2

Lung alveoli are covered by blood capillaries because the blood of body to get oxygenated from the oxygen which come from the atmosphere to the bronchioles then Enter into the alveoli of lungs which get undergo a process of diffusion with the surrounding blood capillaries which result in the blood coming from the body after diffusion from the cell of body then this blood get oxygenated from it and then it goes to again  body cell in order to oxygenate the body cell