How does aerobic exercise help prevent cardiovascular diseases?

• A. By increasing the efficiency of cellular respiration, leading to improved heart and blood vessel function
• B. By causing the heart to beat irregularly, which reduces blood pressure
• C. By decreasing the number of mitochondria in muscle cells
• D. By promoting the buildup of fatty deposits in arteries

Answer: (A)

Verified step by step guidance

1. Understand the role of aerobic exercise in cellular respiration: Aerobic exercise increases oxygen intake and utilization, which enhances the efficiency of cellular respiration in mitochondria. This process produces ATP, the energy currency of the cell, and supports overall cellular function.
2. Recognize the impact of aerobic exercise on the cardiovascular system: Regular aerobic exercise strengthens the heart muscle, allowing it to pump blood more efficiently. It also improves blood vessel elasticity and reduces the risk of plaque buildup in arteries.
3. Eliminate incorrect options: Analyze the provided choices. Aerobic exercise does not cause the heart to beat irregularly, decrease the number of mitochondria, or promote fatty deposits in arteries. These are contrary to the benefits of aerobic exercise.
4. Focus on the correct mechanism: Aerobic exercise improves heart and blood vessel function by enhancing oxygen delivery and utilization, reducing blood pressure, and lowering the risk of cardiovascular diseases.
5. Conclude with the correct answer: The correct explanation is that aerobic exercise increases the efficiency of cellular respiration, leading to improved heart and blood vessel function, which helps prevent cardiovascular diseases.