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4,000 kilograms is about 15,000 times as heavy as a Human Heart
In other words, the weight of a Human Heart is 0.0000770 times that amount.
(human; adult)
The average human heart weighs about 0.310 kilograms. Each minute, the heart pumps between 10 and 20 liters (3 to 5 gallons) of blood through its chambers.
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