by 
Anonymous
ANSWERS: 4
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The brain controls the heart, the energy comes from the food we eat.
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a lot of it is just from chemical reactions around the heart muscle
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Nothing in the body does anything by itself...it is all connected.
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From the bloodstream, like every other part of the body. Which is why when the arteries taking blood round the outside to the heart muscle clog up, you get heart attacks as the heart runs out of energy to do it's job. Then you need a bypass operation to route blood past the blockage to where it is needed, or a lesser operation to open up the clogged arteries.
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