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Image:Hart_cells_en.png|The heart consists of approximately 300 trillion cells | |||
Image:cells_in_rest_en.png|In rest the heart cells are negatively charged. Through the depolarization by surrounding cells they become positively charged and they contract. | |||
Image:Ion_currents_en.png|During the depolarization sodium-ions stream inwards the cell. Subsequently the calcium-ions stream into the cell. These calcium-ions give the actual muscular contraction. Finally the potassium-ions stream out of the cell. During the repolarisation the ion concentration is corrected. On the ECG, an action potential wave coming towards the electrode is shown as a positive (upwards) signal. Here the ECG electrode is represented as an eye. | |||
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