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→The ECG is a sum of the action potentials from millions of cardiomyocytes
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Because of the spreading of the impulse through the heart, the electric field changes continually in size and direction. The ECG is a graphical visualisation of the electric signals in the heart. | Because of the spreading of the impulse through the heart, the electric field changes continually in size and direction. The ECG is a graphical visualisation of the electric signals in the heart. | ||
=The ECG is a sum of the action potentials from | =The ECG is a sum of the action potentials from millions of cardiomyocytes= | ||
[[Image:Hart_cells.png|thumb|The heart consists of approximately 300 trillion cells]] | [[Image:Hart_cells.png|thumb|The heart consists of approximately 300 trillion cells]] | ||
[[Image:cells_in_rest.png|thumb|In rest the heart cells are negatively charged. Trough the depolarization by surrounding cells they become positively charged and they contract.]] | [[Image:cells_in_rest.png|thumb|In rest the heart cells are negatively charged. Trough the depolarization by surrounding cells they become positively charged and they contract.]] | ||