The Cardiac Cycle

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Both Atria Fill With Blood. An Electrical Impulse from the Sino-Atrial Nodecauses atrial contraction. This impulse is stopped by non-conductive band of tissues, so it does not pass into the ventricles. The pressure in the atria rises and Blood is forced through Atrioventricular valves into ventricles. Impulse from Sino-Atrial Node causes the Atrio-Ventricular Node to produce an impulse.This impulse is channelled down into the


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