explain lymphatic system and their constituents – lymph capillaries ,large lymph vessels,Lymphocytes ,lymph nodes and lymph.
Answers
Explanation:
The lymphatic system is a network of tissues and organs that help rid the body of toxins, waste and other unwanted materials. The primary function of the lymphatic system is to transport lymph, a fluid containing infection-fighting white blood cells, throughout the body.
Answer:
Lymph (or lymphatic ) vessels are thin-walled valved structures that carry lymph.
Lymph vessels are lined by endothelial cells and have a thin layer of smooth muscles and adventitia that bind the lymph vessels to the surrounding tissue.
Lymph movement occurs despite low pressure due to smooth muscle action, valves, and compression during contraction of adjacent skeletal muscle and arterial pulsation.
When the pressure inside a lymphangion becomes high enough, lymph fluid will push through the semilunar valve into the next lymphangion, while the valve then closes.
Lymph vessels are structurally very similar to blood vessels.
Valves prevent backwards flow of lymph fluid, which allows the lymphatic system to function without a central pump.
Key Terms
lymphagion: The space between two semilunar valves of the lymphatic vessels that forms a distinct functional unit for the forward flow of lymph.
adventitia: The outermost layer of connective tissue encasing a visceral organ or vessel.
ISF: Interstitial (or tissue) fluid, a solution that bathes and surrounds the cells of multicellular animals. It is the main component of extracellular fluid, which also includes plasma and transcellular fluid.
endothelial cells: A thin layer of cells that lines the interior surface of blood and lymphatic vessels, forming an interface between circulating blood or lymph in the lumen and the rest of the vessel wall.