Why isn’t our heart tired after beating for so long?
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Cells contain what are known as mitochondria which are nicknamed the powerhouse of the cell. This is because they provide the cell with chemicals which are used to power the cell. The mitochondria can only produce so much of these chemicals so fast.
Heart muscle cells contain a lot more mitochondria than other cells. This makes them unlikely to run out of the chemicals to keep them going so heart muscle is unlikely to run out of energy.
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