MEDICAL PHYSIOLOGY

Detailed explanation-1: -Deoxygenated blood from the lower half of the body enters the heart from the inferior vena cava while deoxygenated blood from the upper body is delivered to the heart via the superior vena cava . Both the superior vena cava and inferior vena cava empty blood into the right atrium.

Detailed explanation-2: -Veins. Veins have one-way valves instead of muscles, to stop blood from running back the wrong way. Generally, veins carry deoxygenated blood from the body to the heart, where it can be sent to the lungs.

Detailed explanation-3: -The heart is a hollow, muscular organ that pumps oxygenated blood throughout the body and deoxygenated blood to the lungs.