why heart beat happens in our body?
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because heart pump blood to different parts of our body ..it can also happens from systolic and diastolic pressure...
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When you are resting, you will probably feel between 70 and 100 beats per minute. When you run around a lot, your body needs a lot more oxygen-filled blood. Your heart pumps faster to supply the oxygen-filled blood that your body needs. You may even feel your heart pounding in your chest.
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