The exchange of gases between the lungs and the blood occurs by the process of
A) diffusion.
B) osmosis.
C) filtration.
D) active transport.
E) ionic bonding.

Question

Quizplus · Accepted Answer

The exchange of gases between the lungs and blood occurs through diffusion. Oxygen from the air in the lungs moves across the walls of the alveoli and into the capillaries surrounding them, where it binds to hemoglobin in red blood cells. At the same time, carbon dioxide produced by cellular respiration diffuses out of the blood and into the lungs to be expelled.

The Exchange of Gases Between the Lungs and the Blood