Learn about The Heart Mitral Valve in this educational video from dizzo95.
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Male Speaker: The mitral or bicuspid valve lies between the left atrium and ventricle, one of the heart's four valves is the only one with two rather than three flaps. As viewed from underneath an opened valve shows that attached each valve flap there are tough inelastic tendons which in turn are anchored to papillary muscles. Extensions of the ventricle valve, when blood is pumped into the ventricle from the atrium the papillary muscles relax allowing the flaps to move apart and the valve to open. When the ventricle contracts to force blood into the aorta the attached papillary muscles also contract. This puts tension on the tendons and which pull the flaps together to prevent a back flow of blood.