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Figure 19. Structure of artery and vein

Through the capillaries, the liquid component of the blood penetrates into the
intercellular fluid. To prevent the fluid from accumulating here, its outflow is carried
out through the lymphatic vessels. In the lymphatic system, as well as in the circulatory

system, smaller vessels unite into larger ones. The intercellular fluid penetrates through
the lymphatic capillaries and forms lymph.
Lymphatic vessels pass through the lymph nodes, where harmful
microorganisms are destroyed. In the nodes there are a large number of lymphocytes
that are actively involved in the immune reactions of the body. Lymphatic vessels unite
into ducts that flow into large veins. Due to this, fluid returns to the bloodstream from
the tissues.

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