Blood enters into what structure when it returns to the heart from the lungs?

or:Blood enters into what structure when it returns to the heart from the lungs?or:Deoxygenated blood returning from the body first enters the heart

or:Blood enters into what structure when it returns to the heart from the lungs?

or:Deoxygenated blood returning from the body first enters the heart from the superior and inferior vena cava. The blood enters the right atrium and is pumped through the tricuspid valve into the right ventricle. From the right ventricle, the blood is pumped through the pulmonary semilunar valve into the pulmonary trunk.

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