The Lymphatic System

The Lymphatic System is very important. It helps with theCardiovascular system, and our immune systems. The Lymphatic System is made upof two semi-independent parts. One is a network of lymphatic vessels. Theother part is various lymphoid tissues and organs all over the body. Thefunctions of the Lymphatic System transporting fluids that have escaped from theblood vascular system, and the organs house phagocytic cells and lymphocytes.Lymphatic vessels are an elaborate system of drainage vessles thatcollect the excess protein-containing fluid and returns it to the bloodstream.

.Once an interstitial fluid enters the lymphatics it is called lymph. Thelymphatic vessels form a one way system in which lymph flows only towards theheart. This entire transport sytem starts in the lymph capillaries.

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These arevery commmon, usually occur in the places blood capillaries occur. Lymphcapillaries are not found in bone, teeth, bone marrow, and entire centralnervous system. Lymphatic capillaries are very permeable. The endothelial cellsthat make up the walls of the capillaries are not tightly joined. Filamentanchor the endothelium cells so they can expand. Pathogens can spread throughthe body through the lymphatic stream.There are many cells in the lymphoid tissue.

One type is lymphocytes,which are reffered to often as T or B cells. Plasma cells are antibody-producingoffspring of B cells. Macrophages are phagocytes that help out with immunity.Reticular cells are cells that form the lymphoid tissue stroma. Thes cells arevery important parts of the immune system.The Lymphatic System also contains tissues. The tissue of the LymphaticSystem is reticular connective tissue. It hold the macrophages and changes thenumber of lymphocytes.

It is an important part of the immune system. TheLymphoid tissue can be found in the follicles. Lymphoid organs are discrete andencapsulated. The main lymphoid organs are the spleen, tonsils, thymus andlymph nodes.

The lymph nodes are placed along the lymphatic vessels. Each node has afibrous capsule, a cortex, and a medulla. The lymph nodes circulate fluids.The lymph enters the lymph nodes through afferent lymphatic vessels and exitsthrough the efferent vessels. (afferent=enter, efferent=exit)Most lymphoid organs contain both macrophages and lymphocytes. Thespleen is a place for immune function, and it kills defective or aged red bloodcells and blood-borne pathogens. The spleen also stores platelets, products ofhemoglobin, and acts as hematopoietic sites in the fetus.

The Thymus containshormones. It is mostly functional in youth. Peyers patches are on the tonsils,intestional wall, lymphatic nodules of the appendix and nodules of the respitorytract. (MALT)The many functions of the lymphatic system help the body to maintainbody homeostasis.

Some of the functions are removing foreign matter, maintaincorrect blood volume, and very important in immunity. I never really realizedthat the lymphatic system had so many functions. It seems to be a very importantpart of the body. The immunity part is very important.

Category: Science