Question

Which of the following is the long-term effect of exercise on the respiratory system?

• A. Residual volume increases
• B. Respiratory rate increases
• C. Stroke volume increases
• D. The rate of exchange of gas increases

Hint:

To distinguish between Cardiovascular and Respiratory effects: If it involves blood flow or the heart (like Stroke Volume), it's Cardiovascular. If it involves breathing or gas exchange, it's Respiratory.

Answer 1

The Correct Option is D

The question asks about the long-term effects of exercise on the respiratory system. Let's evaluate each option to determine the correct answer.

1. Residual volume increases: Residual volume is the amount of air remaining in the lungs after a forceful expiration. Regular exercise generally does not increase the residual volume significantly; rather, it tends to improve lung capacity and efficiency.
2. Respiratory rate increases: Regular exercise can make the respiratory system more efficient. In well-trained individuals, the resting respiratory rate often decreases due to increased efficiency of oxygen exchange, not the opposite.
3. Stroke volume increases: Stroke volume refers to the volume of blood pumped from the heart with each beat. This is more directly related to the cardiovascular system rather than the respiratory system. Thus, this is not a correct answer to the question posed.
4. The rate of exchange of gas increases: Regular exercise enhances the efficiency of the respiratory system, improving the rate and efficiency of gas exchange. This is because exercise increases the demand for oxygen and the need to expel carbon dioxide, which enhances the lungs' ability to exchange gases more effectively. This is the correct and long-term effect of exercise on the respiratory system.

Conclusion: Based on the explanations above, the correct answer is The rate of exchange of gas increases. This is a result of the body needing to meet increased oxygen demands and efficiently expel carbon dioxide during and after physical activity, leading to adaptations that improve respiratory efficiency over the long term.