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There are two the superior (from the head) and inferior (from the body) vena cava.
both the superior and inferior vena cava pump the blood into the right atrium. Then, the right atrium pumps the blood through a valve, and into the right ventricle.
oxygenated blood
The superior vena cava conducts blood from the head to the right atrium.
Blood that comes in to the right atrium comes from the pulmonary vein.
capilaries
th blood vessel that goes to the right atrium is cava
coronary sinus
The Superior and inferior vena cava.
The superior vena cava
blood first enters the heart through the right atrium.
vena cava (superior and inferior)