Closely connected with the blood and circulatory system. the lymphatic system is an extended drainage system that returns H2O and proteins from assorted tissues back to the blood watercourse.

When blood reaches the arterial terminal of the capillary beds in the organic structure tissues. fluid from the plasma is forced out of the capillaries by the blood force per unit area in to a infinite between the capillaries and the tissue cells. This fluid. called tissue fluid. is plasma that has permeated through the blood capillary walls and has surrounded the cells to convey them alimentary and to take their waste substances. Tissue fluid is an aqueous solution incorporating glucose. aminic acids. fatty acids. inorganic ions. O and endocrines. which diffuse into the tissue cells to transport out the metabolic reactions.

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Most of the tissue fluid. now incorporating fewer foods and less O but more C dioxide and metabolic waste merchandises. base on ballss back into the venous terminal of the capillary web and so back to the bosom. The little sum of Tissue fluid that remains is picked up by bantam vass called the lymph capillaries. The cells organizing the walls of the lymph capillaries are slackly fitted together. therefore doing the wall really porous. Even the big serum proteins that filtered through the capillary wall base on balls easy from the tissue fluid into the inside of the lymph capillary. The lymph capillaries drain into still larger vass that make up the lymphatic system. The flow through the lymph vass is rather slow. The lymphatics resemble the venas in their construction holding ;

1 ) An outer coat of hempen tissue

2 ) A in-between coat of muscular elastic tissue

3 ) An interior liner made up a individual bed of epithelial cells

Besides like the blood in the venas. contraction of skeletal musculuss compresses the lymph vass and squeezes the plasma fluid- now called lymph- along. Again like return of the blood in the venas. the lymph can flux merely in one way because of valves in the vass.

There are besides several hundred lymph nodes. ( concentrated countries of lymph cells and macrophages ) scattered throughout the lymphatic system particularly in the



*Abdomen and


These contain pits called fistulas. into which the lymph flows through the afferent vas. The walls of the fistulas are lined with phagocytic cells. which engulf foreign organic structures e. g. bacteriums which may be present in the lymph. Trials have demonstrated that over 99 % of the bacteriums carried to the node are screened out before the lymph leaves the node and returns to the blood. The filtering mechanism is one of the most of import organic structure defense mechanisms against infective disease. When battling a heavy infection. the lymph nodes enlarge because of dead white cells. to give what we know as ‘swollen Glands’ .

I conclude to state that the lymphatic system is portion of the circulatory system because the lymph comes from the blood and returns to the blood. and because its vass are really similar to the venas and capillaries of the circulatory system. Throughout the organic structure. wherever there are blood vass. there are lymph vass. and the two systems work together.

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