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Your heart rate increases when exercising because: a. your muscle cells need more oxygen b. your muscle cells start growing faster c. your heart creates more blood d. your heart sends more blood to the
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Your heart rate increases when exercising because:

a. your muscle cells need more oxygen
b. your muscle cells start growing faster
c. your heart creates more blood
d. your heart sends more blood to the muscle cells

User Serge Velikan
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4 votes
Answer: D
Explanation: During exercise, the humans body needs more oxygen than the normal cardiac output, because your muscles are needing it. The heart beats faster to get more blood to your body.
User Lucasreta
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