mitral valve

the valve between the left atrium and left ventricle of the heart, preventing a flow of blood back into the atrium during systole

See mitral valve in American Heritage Dictionary 4

noun
A valve of the heart, composed of two triangular flaps, that is located between the left atrium and left ventricle and regulates blood flow between these chambers. Also called bicuspid valve, left atrioventricular valve.

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