Final answer:
The thoracic duct, which is a part of the lymphatic system, is responsible for draining lymph from most of the body, including the lower limbs, abdomen, pelvis, and left side, into the left subclavian vein.
Step-by-step explanation:
The thoracic duct drains lymph from most of the body into the left subclavian vein. The lymphatic system includes superficial and deep lymphatics, which converge into larger lymphatic vessels known as lymphatic trunks. Unlike the right lymphatic duct, which only drains the upper right portion of the body into the right subclavian vein, the thoracic duct begins at the cisterna chyli and receives lymph from the lower abdomen, pelvis, and lower limbs through the lumbar and intestinal trunks. This comprehensive duct is responsible for transporting lymph from the lower limbs, left thorax, left upper limb, and the left side of the head.
The thoracic duct drains lymph from most of the body into the left subclavian vein. It begins just beneath the diaphragm in the cisterna chyli, which is a sac-like chamber that receives lymph from the lower abdomen, pelvis, and lower limbs.