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jolli1 [7]
3 years ago
15

A person who's resting heart rate is 55 and after exercise, his heart rate is 160, is said to have a well developed heart muscle

. Why is this so?
Biology
1 answer:
GalinKa [24]3 years ago
5 0
Because when exercising your heart pumps more blood to your body and 
it has more space to fill so it beats faster
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