![]() ![]() The right atrium, therefore, acts as a reservoir to collect deoxygenated blood. Also, deoxygenated blood from the heart muscle itself drains into the right atrium via the coronary sinus. The right atrium receives deoxygenated blood from the entire body except for the lungs (the systemic circulation) via the superior and inferior vena cavae. The heart consists of four chambers organized into two pumps (right and left) to provide blood flow to the systemic and pulmonary circulations.
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