How does the content of the blood change when it leaves the tight atrium and enters the right atrium
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Blood flows from your right atrium into your right ventricle through the open tricuspid valve. When the ventricles are full, the tricuspid valve shuts. This prevents blood from flowing backward into the atria while the ventricles contract (squeeze).
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When the right ventricle contracts, blood is forced through the pulmonary semilunar valve into the pulmonary artery. ... In the lungs, the blood receives oxygen then leaves through the pulmonary veins. It returns to the heart and enters the left atrium.
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