APPLIED RADIOLOGICAL ANATOMY

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: -The superior and inferior vena cava are both large veins of the body, responsible for returning deoxygenated blood back to the heart at the point of the right atrium. The superior vena cava collects blood from aspects of the body above the diaphragm, while the inferior vena cava collects blood from below the diaphragm.

Detailed explanation-3: -The deoxygenated blood shoots down from the right atrium to the right ventricle. The heart then pumps it out of the right ventricle and into the pulmonary arteries to begin pulmonary circulation. The blood moves to the lungs, exchanges carbon dioxide for oxygen, and returns to the left atrium.

Detailed explanation-4: -The right atrium receives deoxygenated blood from the entire body except for the lungs (the systemic circulation) via the superior and inferior vena cavae. Also, deoxygenated blood from the heart muscle itself drains into the right atrium via the coronary sinus.