PATHOLOGY

Detailed explanation-1: -Oxygen-poor blood returns from the body to the heart through the superior vena cava (SVC) and inferior vena cava (IVC), the two main veins that bring blood back to the heart. The oxygen-poor blood enters the right atrium (RA), or the right upper chamber of the heart.

Detailed explanation-2: -The superior vena cava returns deoxygenated blood from the upper portion of the body including the head, neck, arms, and chest while the inferior vena cava returns blood to the heart from the lower portion of the body including the abdomen, pelvis, legs, and feet.

Detailed explanation-3: -The vena cava are the two largest veins that carry blood into the right upper chamber of the heart (the right atrium). The superior vena cava carries blood from the brain and arms into the top of the right atrium.