Directions : In the following question more than one of the answers given may be correct. Select the correct answer and mark it according to the code:
Which of the following statements are correct? A marathon runner is likely to show (1) reduced heart rate (2) enlarged heart (3) larger stroke volume (4) decreased arterial blood pressureA) 1, 2 and 3 are correct
B) 1 and 2 are correct
C) 2 and 4 are correct
D) 1 and 3 are correct
Correct Answer: A
Solution :
Marathon runners have greater stamina and their heart rate is slow, with enlarged and scout heart muscles. \[\text{Stroke}\,\text{Volume=}\frac{\text{Minute}\,\text{volume}}{\text{Heart}\,\text{rate}}\] Thus, greater the heart rate, smaller the stroke volume.
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