How does blood flow from the left hand to the heart?

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Blood flowing from any part of the body, including the left hand, enters the right side of the heart through either the superior vena cava or the inferior vena cava. Since blood from the left hand would be coming to the heart from the upper part of the body, it would enter via the superior vena cava. From the superior vena cava, the blood would be passed onto the right atrium. When the right atrium contracts, blood is pushed through the tricuspid valve and into the right ventricle. From the...

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