how can heart keep on working for a long time
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The right side of your heart receives oxygen-poor blood from your veins and pumps it to your lungs, where it picks up oxygen and gets rid of carbon dioxide. The left side of your heart receives oxygen-rich blood from your lungs and pumps it through your arteries to the rest of your body.
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A heart weighs about 340 grams and is red-brown in colour. It is a four chambered pump, and pumps blood daily through about 96000 km of blood vessels. The heart muscles are very strong. It works day and night and only rests between its beats, though only for half a second.
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