The blood enters through the superior and inferior vena cava.
Blood that comes in to the right atrium comes from the pulmonary vein.
capilaries
The superior vena cava carries blood from the upper half of the body to the heart, while the inferior vena cava carries blood from the lower half of the body to the heart, both entering into the right atrium, these are both veins.
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The pulmonary veins bring oxygenated blood from the lungs to the left atrium of the heart.
The Superior and inferior vena cava.
blood first enters the heart through the right atrium.
vena cava (superior and inferior)
Veins, specifically the vena cava, enters the right atrium of the heart.
The answer to your questions is the superior and inferior vena cava.
coronary sinus
The Pulmonary Vein carries oxygenated blood from the lungs to the left atrium of the heart.