Deoxygenated blood will enter the right atrium and will be forced into the right ventricle, in order for it to be oxygenated, what vessel will the blood pass by to enter the lungs?

The pulmonary artery is the vessel through which deoxygenated blood exits the right ventricle and is directed towards the lungs for oxygenation. After entering the right atrium and then being pumped into the right ventricle, the deoxygenated blood travels through the pulmonary artery, which divides into the left and right branches that lead to the respective lungs. In the lungs, carbon dioxide is exchanged for oxygen, effectively oxygenating the blood.

In contrast, the pulmonary veins are responsible for returning oxygenated blood from the lungs back to the heart, specifically entering the left atrium. The superior and inferior vena cavae are not involved in this process; they are large veins that carry deoxygenated blood from the body into the right atrium. Thus, the pulmonary artery is the essential vessel for transporting deoxygenated blood to the lungs for oxygenation.