In anatomy,<unk> s are thin walled, valved structures that carry lymph. As part of the lymphatic system,<unk> s are complimentary with the vascular system. In contrast to the vascular system, which carries blood under pressure to the entire body, lymph is not under pressure and is propelled in a passive fashion, assisted by the aforementioned valves.  Fluid that leaks from the vascular system is returned to general circulation via lymphatic<unk> s.
Generally, lymph flows away from the tissues to lymph nodes and eventually to either the right lymphatic duct or the largest<unk>  in the body, the thoracic duct. These<unk> s drain into the right and left subclavian veins respectively.
Lymph vessel
Lymph vascular system
Blood vessel
Artery
Deep vein
Lymphatic tissues
Peripheral vein
Lymphatic system