The lungs alveoli are covered with blood capillaries..give reasons
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Alveoli is filled up with oxygen rich air present inside the lungs and covered with blood capillaries so that there could be exchange of Oxygen and Carbon dioxide from blood coming from heart and the de oxygenated blood get changed into oxygenated.
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Gas exchange takes place in the millions of alveoli in the lungs and the capillaries that envelop them. As shown below, inhaled oxygen moves from the alveoli to the blood in the capillaries, and carbon dioxide moves from the blood in the capillaries to the air in the alveoli.
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