Basics: Difference between revisions

1 byte added ,  19 September 2006
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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 milions of cardiomyocytes=
=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.]]