Question

select the correct answer. how does aerobic exercise help prevent cardiovascular diseases? a. it helps you burn lower 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.

Explanation:

Aerobic exercise burns calories, reducing plaque in arteries which improves heart - pumping efficiency and helps prevent cardiovascular diseases. Option A correctly describes this mechanism. Option B is incorrect as aerobic exercise doesn't thin blood in the described way. Option C describes the effect of exercise on heart rate and oxygen supply but not the direct prevention of cardiovascular diseases through plaque reduction. Option D is incorrect as aerobic exercise generally increases heart rate during exercise.

Answer:

A. It helps you burn lower calories, which reduces plaque in the arteries, so that your heart becomes more efficient at pumping blood.