Blood enters the heart through the vena cava and pulmonary vein., The sino-atrial node sends out a wave of electrical activity., The atria contract, forcing blood through the atrio-ventricular valves., The wave of electrical activity is detected by the atrioventricular node and passed along the bundle of His and the Purkyne fibres., The ventricles contract, forcing blood through the semi-lunar valves., Blood leaves the heart through the aorta and pulmonary artery.,

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