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Question

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


  1. Storage of respiratory gases

  2. Exchange of respiratory gases

  3. Protection from bacteria 

  4. Protection of lungs


Solution

The correct option is B

Exchange of respiratory gases


Alveoli are the air sacs that are present at the end of bronchioles. Gas exchange of oxygen and carbon dioxide takes place in the alveoli. Oxygen from the inhaled air diffuses through the walls of the alveoli and adjacent capillaries into the red blood cells. The oxygen is then carried by the blood to the body tissues. 

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