Life Orientation Grade 10 Practice Exam

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Which statement accurately describes the function of the heart and lungs and the effect of regular exercise?

The heart pumps blood; the lungs exchange gases; regular exercise strengthens both heart and lungs.

The heart pumps blood; the lungs exchange gases; exercise has no significant effect on these systems.

The heart carries nutrients to cells; the lungs process digestion; exercise improves mood.

The heart pumps blood; the lungs supply oxygen; regular exercise strengthens both heart and lungs.

Regular exercise boosts how the heart and lungs work together to deliver oxygen to the body's cells. The heart’s job is to pump blood, which carries oxygen and nutrients to all tissues. The lungs take in oxygen from the air and exchange it with carbon dioxide in the blood. Saying the lungs supply oxygen to the blood emphasizes this oxygen transfer, which is exactly what exercise improves—better oxygen uptake and delivery. As you train, the heart becomes more efficient at pumping and the lungs become more effective at getting oxygen into the blood, so both systems strengthen. This ties the function of each organ directly to how exercise enhances performance, which is why this statement is the best fit.