Question

5
select the correct answer.
how does aerobic exercise help prevent cardiovascular diseases?
a. it helps you burn fewer calories, which reduces plaque in the arteries, so that your heart becomes more efficient at pumping blood.

b. it warms your blood, making it more fluid, so that your heart can pump more efficiently and slowly, creating less stress on the heart.

c. it makes your heart beat faster to supply more oxygen, which makes the heart stronger and enables it to pump blood more efficiently.

d. it lowers your heart rate, which allows your heart to better dispose of fat cells before they form plaque on the artery walls.

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Explanation:

To determine the correct answer, we analyze each option:

• Option A: Burning calories reducing plaque to improve heart efficiency is incorrect as exercise's main cardiac benefit isn't just calorie - related plaque reduction.
• Option B: Exercise doesn't "warm blood" to make it flow better. Blood temperature is regulated by the body's thermoregulatory system, not exercise in this way.
• Option C: Aerobic exercise makes the heart beat faster during exercise to supply more oxygen. Over time, this strengthens the heart muscle, enabling it to pump blood more efficiently. This aligns with the physiological effects of aerobic exercise on the heart.
• Option D: Aerobic exercise typically increases heart rate during activity (and can lower resting heart rate over time, but the description here about disposing of fat cells to prevent plaque is not the main mechanism described correctly).

Answer:

C. It makes your heart beat faster to supply more oxygen, which makes the heart stronger and enables it to pump blood more efficiently.