Question

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.

Explanation:

To determine how aerobic exercise prevents cardiovascular diseases, we analyze each option:

• Option A: Burning fewer calories would not reduce plaque (plaque is related to fat/cholesterol buildup, and aerobic exercise typically burns more calories). Eliminate A.
• Option B: Warming blood does not directly make the heart pump more efficiently or reduce stress on the heart. This is not a valid mechanism. Eliminate B.
• Option C: Aerobic exercise strengthens the heart muscle, increasing its efficiency to pump blood. A stronger heart that beats harder (to supply more oxygen) can pump blood more efficiently, reducing strain and risk of cardiovascular diseases. This aligns with physiological principles.
• Option D: Lowering heart rate is not the primary benefit of aerobic exercise for cardiovascular health (aerobic exercise typically increases heart rate during activity to improve fitness). Eliminate D.

Answer:

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