A valve is a structure in the body that allows fluid to move along the body. The main heart valves are the aortic, pulmonary, tricuspid and mitral valves. These valves work in coordinated movements, so that while the mitral and tricuspid valves open to allow blood to flow into the heart for example, the aortic and pulmonary valves remain closed. This ensures one-directional blood flow for proper blood circulation.
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