39. Digestive System
Digestion
Multiple Choice
Multiple ChoiceThe 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 most similar in function to these air sacs and capillaries are the __________.
A
esophagus
B
gastric glands
C
cecum
D
sphincters
E
villi and microvilli
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