Internal structure of Heart

The heart's internal structure consists of four chambers: two atria and two ventricles, separated by valves that regulate blood flow. Here's a breakdown of the internal structure:

• Right Atrium: Receives deoxygenated blood from the body through the superior and inferior vena cava.
• Left Atrium: Receives ______ ___ ________ ______ _____ ________ _________.
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