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MAXImum [283]
3 years ago
12

L Pretest: Unit 5

Biology
1 answer:
slava [35]3 years ago
8 0

Answer: O C. The shapes of the alveoli and the capillaries increase the surface  area of the membranes.

Explanation:

Alveoli are tiny air sacs in the lungs, which takes the oxygen inside them. The membranes of the alveoli and the capillaries expand to take up the oxygen whereas the contract or becomes narrower when they expel out the carbon dioxide gas. Thus the shapes of the membranes of the alveoli and capillaries play an important role during exchange of gases.  

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