What is the function of sac like structures present at the end of bronchioles?

Storage of respiratory gases

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Exchange of respiratory gases

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Protection of lungs

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Protection from bacteria

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Solution

The correct option is B
Exchange of respiratory gases

Alveoli or air sacs are formed at the end of bronchioles.They increase the surface area as they are numerous in nature. The increased surface area helps in increased exchange of gases from surrounding capillaries.

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Assertion : Aerobic respiration involves the exchange of respiratory gases twice in multicellular animals.

Reason : Exchange occurs from lung to heart and then heart to lung.

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