PATHOLOGY

Detailed explanation-1: -There is no pump in the lymphatic system like the heart in the cardiovascular system. The pressure gradients to move lymph through the vessels come from the skeletal muscle action, respiratory movement, and contraction of smooth muscle in vessel walls.

Detailed explanation-2: -Accordingly, when the muscle contracts, the lymphatics collapse and propel fluid forward, with the valvular structure of the lymphatic capillaries allowing only unidirectional flow of lymph (Skalak et al. 1984).

Detailed explanation-3: -They lack a central pump (like the heart in the cardio vascular system), so smooth muscle tissue contracts to move lymph along through the vessels. Skeletal muscle contractions also move lymph through the vessels. The lymphatic vessels make their way to the lymph nodes, and from there the vessels form into trunks.