Why athletes usually have bigger size of hearts as compare to other?

1.	Why athletes usually have bigger size of hearts as compare to other?
Answer» Why ATHLETES USUALLY have bigger size of HEARTS as compare to other? Choose the answer from below options (1)Athletes blood is thicker and needs more heart muscle to circulate it (2)Grater blood pressure that developed during the workout requires thicker heart walls (3)Athletes cardiac output is regulated by change of cardiac RATE during the workout (4)Athletes cardiac output is regulated by change of stroke volume workout Answer:-(3)Athletes cardiac output is regulated by change of cardiac rate during the workout

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