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potential space between the visceral and parietal pericardium, contains serous fluid
lines the cavities of the heart, covers the valves and smooth muscle that opens and closes the valves
3 leaflets or cusps. allows blood to enter RV when RV relaxes and closes when RV contracts
branch from the aorta as it leaves the heart and curl back across the chambers of the heart
receives impulses from the SA node, it's delayed to allow the atria to empty and the ventricle to fill with blood
place electrodes on skin, electrodes are connected to wires on EKG machine, which picks up the current and records it on special paper
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