How does the structure of the alveoli allow for its function of gas exchange? alveolar sacs produce mucus that makes gas exchange easier. alveolar sacs rely on valves to ensure that air flows only in one direction. alveolar sacs are located within muscles that contract, which increases gas exchange. alveolar sacs are surrounded by thin capillaries where gases can be exchanged.

Structure of alveoli play important role in its function of gas exchange. For example, alveolar sacs are found in alveoli and it produce mucus which is fluid that helps alveoli to exchange gas in easier way. Actually alveolar sacs mainly rely on valves to ensure that air only flows in one direction. Alveolar sacs are mainly present inside the muscles which when contract increases gaseous exchange. Alveolar sacs are actually covered by thin capillaries where gases can be exchanged.

The correct statement is - Alveolar sacs are surrounded by thin capillaries where gases can be exchanged.

Explanation:

Tiny balloon-like structures and the tiniest passageway in the respiratory system are alveoli. These are actually tiny air sacs helps in rapid gaseous exchange.  

The alveoli allow the easy passage for oxygen and carbon dioxide (CO₂) between blood vessels and the alveoli.

These thin capillaries surround the alveolar sacs, both have very thin walls that allow easy gaseous exchange.

Thus, the correct statement is the last statement.

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c. is the correct answer