Which of the following statement is/are correct?
A marathon runner is likely to show
1. Reduced heart rate
2. Enlarged heart
3. Larger stroke volume
4. Decreased arterial blood pressure
1, 2 and 3
For a marathon runner, the heart rate is about 38 beats per minute. The heart is slightly enlarged as the stroke volume increases according to how you exercise, because your body needs more oxygen and nourishment, which are both received from the blood.