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Friday, 17 August 2018

What is THE LYMPHATIC SYSTEM and give Their Function?




THE LYMPHATIC SYSTEM


The lymphatic system of vertebrate start with small vessels called lymphatic capillaries, which are in direct contact with the extracellular fluid surrounding tissues (see fig).


The system has four major functions:
(1) To collect and drain most of the fluid that drip from the bloodstream and accumulates in the extracellular fluid,
 (2)  Small amounts of proteins is return that have left the cells.
(3) To transport lipids that have been absorbed from the small intestine.
 (4) To transport foreign particles and cellular debris to disposal centers called lymph nodes.
 The small lymphatic capillaries merge to form larger lymphatic vessels called
lymphatics.
 Lymphatics are thin-walled vessels with valves that ensure the one-way flow of lymph. Lymph is the extracellular fluid that accumulates in the lymph vessels. These vessels pass through the lymph nodes on their way back to the heart. Lymph nodes concentrate in several areas of the body and play an important role in the body’s defense against disease.



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