AV node - collects impulse, delays it to allow atria to finish contracting, Bundle of his - splits impulse in two, purkyne fibres - distribute impulse through ventricle walls, SA node - generates electrical impulse (pacemaker), myogenic - capacity to generate own electrical impulse, pulmonary circuit - carries oxygenated blood to body and deoxygenated blood back to heart, systemic circuit - carries deoxygenated blood to lungs and oxygenated blood back to heart, diastole - relaxation of cardiac muscle: atria & ventricles, systole - contraction of cardiac muscle: aorta then ventricles, atrial systole - atria contract, remaining blood forced to ventricles, ventricular systole - SL valves forced open blood ejected from ventricles to aorta & pulmonary artery, diastole 2 - pressure in atria increases opening AV valves, heart beat - 72 times a minute at rest, conduction system - structures in cardiac muscle-create & transmit an electrical impulse-force ventricles & atria to contract,

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