The exchange of oxygen between blood and air takes place in the _______?
B. Lungs
C. Heart
D. All of these
Correct Answer: B. Lungs
Explanation: The exchange of oxygen and carbon dioxide between the air and the bloodstream occurs primarily in the lungs. The alveoli in the lungs allow for the diffusion of oxygen from the air into the bloodstream, and the diffusion of carbon dioxide from the bloodstream into the air, so that oxygen can be supplied to the body’s cells and waste products can be removed. The heart helps pump blood and transport oxygen throughout the body, but it does not directly participate in the exchange of gases between the air and the blood. The nose filters and moistens the air before it reaches the lungs, but the actual exchange of gases takes place in the lungs.
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