Which Part of the Respiratory System Exchanges Oxygen and Carbon

Question

Which part of the respiratory system exchanges oxygen and carbon dioxide?
A) pharynx
B) bronchi
C) alveoli
D) trachea

Accepted Answer

The alveoli are small air sacs in the lungs where gas exchange occurs. Oxygen from the air we breathe diffuses through the walls of the alveoli and into the bloodstream, while carbon dioxide from the bloodstream diffuses into the alveoli to be exhaled out of the body.