Transport lymph towards the heart, resembling veins.

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Transport of lymph toward the heart is carried by the lymphatic vessels, the network that collects interstitial fluid and returns it to the venous system. These vessels run throughout the body and have one-way valves, thin walls, and smooth muscle that help push lymph along as muscles contract. The resemblance to veins comes from their structure and function: they are low-pressure channels with valves that prevent backflow. Lymph capillaries are the tiny, blind-ended start of the system and don’t resemble veins. Lymph nodes filter lymph rather than transport it. Lymph ducts are large vessels that eventually drain into the veins, but the general transport toward the heart is achieved by the lymph vessels.