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This happens thanks to the valves of the heart, located between the atria and ventricles. Between the left atrium and left ventricle we have the bicuspidal valve (aka mitral valve, latin: valva bicuspidalis/mitralis). Between the right atrium and right vetricle we have the tricuspidal valve (latin: valva tricuspidalis).

We also have semilunar valves (latin: valvae semilunares) located on the aorta and the pulmonary artery, that stope the backflow of blood from the vessels, back into the vetricles.

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