Atriums contract and pass the blood to ventricles. Ventricles contract and blood is passed outside the heart. Despite of high pressure exerted by the ventricles, blood never goes back to atriums. How? explain?
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The four chambers of the heart are the right atrium, the right ventricle, the. ... Blood passes from the right atrium through the tricuspid valve and into the right ventricle. When the right ventricle contracts, the muscular force pushes blood ... out of the lungs via the pulmonary veins, and travels to the left atrium.
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