MEDICAL PHYSIOLOGY

Detailed explanation-1: -All veins are carried deoxygenated blood except the pulmonary vein which carries oxygenated blood from the lungs to the left atrium of the heart. Small vessels are called venules that continue from capillaries, merge to form veins, and drain the blood from capillaries into veins.

Detailed explanation-2: -Your main pulmonary artery and your aorta are the two great vessels that carry blood out of your heart. A crucial difference is that your pulmonary artery carries oxygen-poor (deoxygenated) blood, while your aorta carries oxygen-rich (oxygenated) blood.

Detailed explanation-3: -While veins usually carry deoxygenated blood from tissues back to the heart, in this case, pulmonary veins are among the few veins that carry oxygenated blood instead. Oxygenated blood from the lungs is circulated back to the heart through the pulmonary veins that drain into the left atrium.

Detailed explanation-4: -The superior vena cava and inferior vena cava are veins that return deoxygenated blood from circulation in the body and empty it into the right atrium. The pulmonary artery carries deoxygenated blood from the right ventricle into the lungs for oxygenation.