Question

How does the structure of the alveoli allow for its function of gas exchange?

A.Alveolar sacs produce mucus that makes gas exchange easier.
B.Alveolar sacs rely on valves to ensure that air flows only in one direction.
C.Alveolar sacs are located within muscles that contract, which increases gas exchange.
D.Alveolar sacs are surrounded by thin capillaries where gases can be exchanged.

Answer 1

d

Step-by-step explanation:

Answer 2

The correct answer would be D.Alveolar sacs are surrounded by thin capillaries where gases can be exchanged.

Alveoli are tiny sacs which form the site of gas exchange in the lungs.

The features of alveoli which help in gas exchange are:

• They increase the surface area in the lungs thus, more space is available for gas exchange.
• They have very thin walls, as thin as the thickness of a single cell only.
• They are surrounded by a bunch of thin capillaries which exchange gases with alveoli.