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The lungs consist of many small air sacs and blood vessels, which greatly increase surface area and improve the transfer of substances through their walls. The structures in the digestive system similar
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The lungs consist of many small air sacs and blood vessels, which greatly increase surface area and improve the transfer of substances through their walls. The structures in the digestive system similar in function to these air sacs and capillaries are the _____.

User Sandeepmaaram
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Answer: Villi (plural) or villus (singular)

Explanation: small protrusions on the inside of the intestinal walls, to increase surface area for absorption.

User Ian Langmore
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