As Blood Moves Through the Pulmonary Capillaries, ______

Question

As blood moves through the pulmonary capillaries, ______.
A) carbon dioxide moves from the alveoli into the blood
B) oxygen moves from the blood into the alveoli
C) carbon dioxide moves from the blood into the alveoli
D) oxygen binds to carbon dioxide

Accepted Answer

Carbon dioxide moves from the blood into the alveoli during pulmonary gas exchange. Oxygen moves from the alveoli into the blood. This exchange occurs due to differences in concentration and partial pressures of the gases between the air in the alveoli and the blood in the pulmonary capillaries. Oxygen and carbon dioxide do not bind to each other during this process.