GENERAL HISTOLOGY

Detailed explanation-1: -Lymphatics and lymph flow. Lymph vessels are lined by endothelial cells and contain valves to prevent lymph from flowing back. The flow of lymph is supported by alternate contraction and relaxation of smooth muscle and compression during contraction of adjacent skeletal muscle and arterial pulsation.

Detailed explanation-2: -Lymphatic vessels collect and filter lymph (at the nodes) as it continues to move toward larger vessels called collecting ducts. These vessels operate very much like your veins do: They work under very low pressure, have a series of valves in them to keep the fluid moving in one direction.

Detailed explanation-3: -To ensure that fluid does not flow backward, all lymphatic have one-way valves. The forward flow of lymph is due to the pressure gradient created by the muscle contractions and respiratory movements. The key feature of lymphatic vessels is that they have thin endothelial walls and have an overlapping arrangement.