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Depolarisation occurs as ions cross the membrane of a cell or a nuron. Ions such as NA+ or K+ make depolarisation happen. Depolarisation can work on a threshold potetional such as in the heart. Threshold potetional A threshold potetional is a self- regenerating wave of electrical current depolairsation. In the hearts cells depolarisation happends when the cells of the heart are brought to a voltage threshold because of NA+ ions.Soduim NA+ is a soft, silvery-white powerderd ion. Soduim is found in sea water and also in rocks. Liquid soduim is used for depolarisation of the heart and is a clear liquid.
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