How much electricity is needed to make the heart beat?

How many volts/amps does it take to stimulate a heart to beat once normally? and does each valve require a different amount?

Where does the electricity come from?

In the heart there are cells specialized in producing electricity. These are called pacemaker cells. They produce electricity by quickly changing their electrical charge from positive to negative and back.

The first electric wave in a heart beat is initiated at the top of the heart. Because of the heart muscle cell’s ability to “spread” its electric charge to adjacent heart muscle cells, this initial wave will be enough to start a chain reaction.

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