Interesting facts about the heart

How much does an average human heart weigh?

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How long does it take blood to get round the body?

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How much blood do we have in our body?

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What percentage of blood is water?

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What should the maximum heart rate be for a twenty-year-old when exercising?

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Whose heart beats faster?

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What percentage of the body's bloodis held in the heart at any moment?

• 17%

• 7%

• 70%

When was the first successful heart transplant carried out?

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