Answer:

Each heartbeat arises from specialized muscle cells called myocytes. When these cells need more oxygen, as during exercise, the brain sends messages to the heart, causing myocytes to make stronger, more frequent pulses. Everyone experiences sudden, temporary changes in their heart rate.

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.

The effect of exercise to our heart is it Improves the muscles' ability to pull oxygen out of the blood, reducing the need for the heart to pump more blood to the muscles. Reduces stress hormones that can put an extra burden on the heart. Works like a beta blocker to slow the heart rate and lower blood pressure.

Explanation:

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