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Atrioventricular (AV) valves
located at each atria ventricular junction
Prevent backflow into the atria when ventricles contract
collagen cords attached to AV valve flap
Anchor AV valve cusps to papillary muscle
In their absence, flaps would be blown upward into atria upon contraction
During heart contraction
intraventricular pressure rises, forcing blood against the valve flaps *closes the flaps
Semilunar (SL) valves
Ventricular contraction and increase in intraventricular pressure--> valves open, cusps flatten against their respective arterial walls; Blood flows into vessels
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