Where does gas exchange occur within the lungs?

A) secondary bronchi
B) bronchioles
C) alveoli
D) none of the above

Gas Exchange

The biological process through which different gases are transferred in opposite directions across a specialized surface, such as in the lungs or leaves of plants.

Alveoli

Tiny air sacs in the lungs where the exchange of oxygen and carbon dioxide takes place during breathing.

Secondary Bronchi

The branches of the main bronchus that lead into each lung, further subdividing into tertiary bronchi.