GROSS ANATOMY

Detailed explanation-1: -Answer and Explanation: Blood vessels enter and exit from the base or superior portion of the heart. The blood vessels returning blood from the body to the right atrium at the superior end are the vena cava and the pulmonary veins return blood from the lungs to the left atrium.

Detailed explanation-2: -Oxygen-poor blood from the body enters your heart through two large veins called the superior and inferior vena cava. The blood enters the heart’s right atrium and is pumped to your right ventricle, which in turn pumps the blood to your lungs.

Detailed explanation-3: -The upper two chambers are called atria (singular: atrium) and the lower two are known as ventricles (singular: ventricle). Muscular walls, called septa or septum, divide the heart into two sides. On the right side of the heart, the right atrium and ventricle work to pump oxygen-poor blood to the lungs.

Detailed explanation-4: -The superior vena cava receives deoxygenated blood from all parts of the upper body, while the inferior vena cava receives the venous return from the lower body (including the abdomen). These two large veins both drain into the right atrium of the heart.

Detailed explanation-5: -A large vein that carries blood to the heart from other areas of the body. The vena cava has two parts: the superior vena cava and the inferior vena cava. The superior vena cava carries blood from the head, neck, arms, and chest.