People who regularly participate in physical exercise have an enhanced function of heart pumping blood, the reason is_______
A. Enlarged heart, containing more blood
B. Myocardium increases in number and contracts forcefully
C. Myocardium is developed and contracted
D. Increased heart rate, strong ability to deliver oxygen
Answer:C
People who regularly participate in physical exercise have an enhanced function of heart pumping blood, the reason is_______
A. Enlarged heart, containing more blood B. Myocardium increases in number and contracts forcefully C. Myocardium is developed and contracted D. Increased heart rate, strong ability to deliver oxygen