What is the common quality present in villi of the small intestine and alveolar sacs of lungs to maximize the action?
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Explanation:
villi present in small intestine are finger like projections which are in millions. they absorb the needful nutrients from the food particles and help them reach the blood.
alveolar sacs of lungs are graps like shaped they too absorb the oxygen from the lungs and help them to reach the RBC of blood for exchange of gases
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