Q: Where does the primary exchange of gases occur in the lungs?  

Answer: C

The exchange of gases in the lungs occurs primarily at the alveoli. The alveoli are tiny, air-filled sacs located at the end of the respiratory bronchioles, and they are covered with a thin layer of simple squamous epithelium. This thin membrane allows for the efficient diffusion of oxygen and carbon dioxide between the air and the blood in the capillaries surrounding the alveoli. The larynx, trachea, and bronchi are not involved in the primary exchange of gases, but rather serve as conduits for air to travel to and from the lungs.

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