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They're parts of the four cardiac chambers.Deoxygenated Blood from the inferior and superior vena cava goes to the the heart's right atrium and through the tricuspid valve in to the right ventricle (which is then pumped to the lungs to rid of CO2 and get O2diffused into the blood). They are both parts of the heart, and They come in pairs inside the heart. They both contain valves that prevent the back flow of blood. A difference is that the atria has thin walls and the ventricle has thick walls. The atria are receiving chambers and the ventricles are discharging chambers - they pump the blood.The septum in-between the atria has the foramen ovale, a closed opening that used to be present in a fetal heart.

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12y ago

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