Which vessel drains blood from the lower parts of the body into the right atrium?

Which vessel drains blood from the lower parts of the body into the right atrium?

• A. Inferior Vena Cava
• B. Superior Vena Cava
• C. Pulmonary Trunk
• D. Left Subclavian Artery

Answer: (A)

Blood from the lower body returns to the heart through a large vein that empties into the right atrium. This vessel collects venous blood from the pelvis, abdomen, and lower limbs and then ascends to pass through the diaphragm before delivering blood to the right atrium. The other options operate differently: one brings blood from the upper body to the right atrium, the pulmonary trunk is an artery carrying blood from the heart to the lungs, and the left subclavian artery is part of the arterial system supplying the left arm.

Blood from the lower body returns to the heart through a large vein that empties into the right atrium. This vessel collects venous blood from the pelvis, abdomen, and lower limbs and then ascends to pass through the diaphragm before delivering blood to the right atrium. The other options operate differently: one brings blood from the upper body to the right atrium, the pulmonary trunk is an artery carrying blood from the heart to the lungs, and the left subclavian artery is part of the arterial system supplying the left arm.