Which vessel receives lymph from the rest of the body?

• A. Thoracic duct
• B. Right lymphatic duct
• C. Cisterna chyli
• D. Lymph nodes

Answer: (A)

The main idea is how lymph returns to the bloodstream. The thoracic duct serves as the primary vessel that returns lymph from most of the body. It collects lymph from the lower body, left side of the head and neck, left upper limb, and left thorax (via the cisterna chyli and surrounding trunks) and empties into the left subclavian vein. That makes it the vessel responsible for draining the majority of the body's lymph back into circulation.

In comparison, the right lymphatic duct handles lymph from the right side of the head and neck, right upper limb, and right thorax, not the entire rest of the body. The cisterna chyli is a dilated sac at the lower end of the thoracic duct that gathering lymph from the lower body, but it isn’t the vessel that returns lymph to the bloodstream by itself. Lymph nodes aren’t transport channels; they filter lymph as it passes through before it continues toward the venous system.