GENERAL HISTOLOGY

Detailed explanation-1: -Thus, the principal task of the lymphatic vascular system is transport. The body must impart energy to the lymph via pumping mechanisms to propel it along the lymphatic network and use pumps and valves to generate lymph flow and prevent its backflow.

Detailed explanation-2: -Pressure within the walls of lymph vessels is lower than that in blood vessels. Lymph flows more slowly than blood. The cell walls of lymph vessels are more permeable than those of the capillary walls of blood vessels.

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.