Valve | Heart, Circulation & Blood | Britannica
https://www.britannica.com/science/valve-anatomy
WEBMar 30, 2024 · valve, in anatomy, any of various membranous structures, especially in the heart, veins, and lymph ducts, that function to close temporarily a passage or orifice, permitting movement of a fluid in one direction only. A valve may consist of a sphincter muscle or two or three membranous flaps or folds. In the heart there are two valves that ...
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