Why does an increased heart rate during exercise help muscles contract?

An increased heart rate will cause an increase in blood flow around the body (increased cardiac output). This means that there will be more oxygen and more glucose being supplied to the muscles. Since oxygen and glucose are required for aerobic respiration, by increasing the blood flow to the muscles, more aerobic respiration can occur. This produces ATP, which releases the energy needed for our muscles to contract.

Answered by Adam D. Biology tutor

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