Active 4 Life Practice Test

What is one benefit of exercise for the cardiovascular system?

The heart becomes fitter, increasing its ability to distribute oxygen to working muscles. Bones become denser with activity. Lungs capacity decreases. Immune function is compromised.

Correct Answer:

The heart becomes fitter, increasing its ability to distribute oxygen to working muscles.

Explanation:

Regular aerobic exercise strengthens the heart, making it more efficient at pumping blood. When the heart muscle becomes fitter, each beat pushes more blood, so the heart can deliver more oxygen to working muscles during activity. Over time this increases cardiac output during exercise and lowers resting heart rate, improving overall circulation and oxygen delivery. That directly describes how the heart distributes oxygen to working muscles, which is the main cardiovascular benefit. Other statements don’t fit the cardiovascular focus: bones becoming denser relates to bone health, not the heart; lung capacity generally improves with training rather than decreases; and regular exercise supports immune function rather than compromising it.

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