Which of the following is a way that physical activity benefits your cardiovascular system?

• A. It raises resting blood pressure over time.
• B. It decreases the amount of oxygen delivered to tissues.
• C. It increases the buildup of plaque in arteries.
• D. It strengthens the heart muscle, improving its efficiency.

Answer: (D)

Verified step by step guidance

1. Understand the role of physical activity in cardiovascular health: Physical activity is known to improve the efficiency of the cardiovascular system by strengthening the heart muscle and enhancing blood circulation.
2. Analyze the incorrect options: Raising resting blood pressure over time is harmful and not a benefit of physical activity. Decreasing the amount of oxygen delivered to tissues contradicts the improved oxygen delivery associated with exercise. Increasing the buildup of plaque in arteries is a negative effect and not related to physical activity benefits.
3. Focus on the correct option: Physical activity strengthens the heart muscle, making it more efficient at pumping blood. This reduces the workload on the heart and improves overall cardiovascular health.
4. Relate the concept to oxygen delivery: A stronger heart improves the delivery of oxygen and nutrients to tissues, which is essential for maintaining healthy body functions.
5. Summarize the benefits: Regular physical activity reduces the risk of cardiovascular diseases, lowers resting heart rate, and enhances the heart's ability to pump blood efficiently, contributing to overall health.