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The lymphatic system and its functions

What are the lymphatic systems?

There is another type of fluid involves in the transportation of human beings. That is called lymph or tissue fluid. Through the pores present in the walls of capillaries some amount of plasma, protein and blood cells escape into intercellular spaces in the tissues to form the tissue fluid or lymph. It is similar to the plasma of blood but colorless and contains protein. Lymph drains into lymphatic capillaries from large lymph vessels that finally open into larger veins. Lymph carries digested and absorbed fat from the intestine and drains excess fluid from extracellular space back into the blood.

A system of tiny tubes called lymph vessels or lymphatics and lymph nodes (lymph glands)  in the body. The function of the lymphatic system transports the liquid called lymph from the body tissue to the blood circulatory system id called the lymphatic system. 

Parts of lymphatics system:
  • Lymph capillaries,
  • Larger lymph vessels,
  • lymph nodes (lymph glands),
  • Lymph.

Lymph capillaries are tiny tubes are present in the whole body, but they differ from blood capillaries are as follows- lymph capillaries are closed-ended and the pores in the walls of lymph capillaries are bigger. 

The lymph capillaries join to form larger lymph vessels. The lymph vessels have lymph nodes (lymph glands) at intervals. The lymph contains a special type of cell called lymphocytes.

Lymphocytes protect the body from diseases. 

What is Lymph?

Lymph is a light yellow liquid that is somewhat similar in composition to blood plasma. Lymph contains large protein molecules and digested food. It also contains germs from the cells and fragments of dead cells. Lymph flows only one direction. - from body tissue to the heart.  lymph is derived from the tissue fluid which remains outside the cells of the body, so it is also called extracellular fluid. 

The function of the lymphatic system:

  • lymph takes part in the nutritive process of the body. It puts into circulation larger protein molecules by carrying them from the tissue into the bloodstream, which could not be absorbed by blood capillaries due to their large size. Lymph also carries digested fat and from the nutritive process.
  • The lymphatic system protects the body from germs by killing them.
  • The lymphatic system helps in removing the waste products like fragments of dead cells.

References: Lakhmir Singh and Manjeet Kaur biology class 10 books.

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