Pwhat change occurs in heartbeat if a person runs for a while and why
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The heartbeat rate increases because the requirement of oxygen increases and the heart tries to provide more oxgenated blood to the muscles
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When you are exercising, your muscles need extra oxygen—some three times as much as resting muscles. This need means that your heart starts pumping faster, which makes for a quicker pulse. Meanwhile, your lungs are also taking in more air, hence the harder breathing.
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