The lungs consist of many small air sacs that greatly increase surface area and thereby facilitate diffusion across a layer of cells. The structures in the digestive system most similar in function to these air sacs are the __________.
a. esophagus
b. gastric glands
c. chief cells
d. sphincters
e. villi and microvilli
Answer: e. villi and microvilli
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a. axon. b. node of Ranvier. c. Schwann cell. d. dendrite. e. glial cell.
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A) winter; summer B) summer; winter C) spring; fall D) fall; spring
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a. in sporangia b. in zygospores c. in asci d. in conidiophores
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Fill in the blank(s) with the appropriate word(s).