What are functions of the right atrium ?!
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The right atrium (in older texts termed the "right auricle") is one of four chambers (two atria and two ventricles) in the human heart. It receives de-oxygenated blood from the superior and inferior vena cavae and the coronary sinus, and pumps it into the right ventricle through the tricuspid .
The right atrium is the chamber of the heart that recieves all the deoxygenated blood of the body from the inferior and superior vena cava, and the coronary sinus. Its function is not only to recieve this blood, but to contribute to forcing this blood into the right ventricle after the passive filling phase of diastole is complete. After the passive filling phase is completed, the right ventricle will contract and pump the remaining blood into the right ventricle in what is known as the active filling phase of diastole and is marked on an EKG reading as the "P" wave, or the first small bump that precedes the spike in normal sinus rhythm.