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The heart works like a pump and beats 100,000 times a day. The heart has two sides, separated by an inner wall called the septum. The right side of the heart pumps blood to the lungs to pick up oxygen. The left side of theheart receives the oxygen-rich blood from the lungs and pumps it to the body.
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The heart can work in two ways(IDK if this two are separate)
it pumps blood throughout the body and back to lung when it is De-oxgenated the to the heart again.
it pumps blood which are full of nutrients to be absorbed the the body thu the capilliaries
not so sure but hope it help a bit :)

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