THORAX ABDOMEN AND PELVIS

Detailed explanation-1: -The superior vena cava and inferior vena cava are very large veins that bring deoxygenated blood to your heart to get oxygen. Your inferior vena cava, your body’s largest vein, carries oxygen-depleted blood back to your heart from the lower part of your body (below your diaphragm).

Detailed explanation-2: -Valves in the veins keep blood flowing in the correct direction. Two large veins that lead into the heart are the superior vena cava and inferior vena cava.

Detailed explanation-3: -The inferior vena cava originates at around the L5 vertebrae where the left and right iliac veins converge, these vessels collect deoxygenated blood from smaller vessels below the diaphragm.

Detailed explanation-4: -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.