give reasons for the following a) alveoli are covered by blood capillaries b) after exhaling some air mains in the lungs
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answer of a oxygen is to be traped by haemoglobin in blood through diffusion which is formed in lungs and capilaries also increase surface area answer of b is if whole air goes out a vaccum will be formed and air will force lung to contract or rush again inside the lungs thus atleat some air must be present in lungs
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Answer:a)The lungs alveoli are covered with blood capillaries as the blood capillaries are the means of transport of the pure air as well as the air rich in carbon dioxide. And after reaching to the alveoli the gaseous exchange takes place.
Explanation:
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