What structure does the lymphatic system have? What functions does it perform? How is the lymphatic system associated with the circulatory system?
In vertebrates, along with the circulatory system, there is also a lymphatic system that performs a drainage role. A lymph circulating through the lymphatic system is formed from blood plasma, which seeps through the blood capillaries and enters the tissue fluid, and from there it is collected in the lymphatic capillaries. The latter are closed at one end of the tube or blindly starting stretching of various shapes. Their walls, like the walls of blood capillaries, consist of one layer of cells and have high permeability to water, proteins, fats, carbohydrates, vitamins, hormones and minerals.
Lymphatic capillaries merge into the lymphatic vessels. A distinctive feature of lymphatic vessels is the presence of valves in their lumen.
The movement of lymph in the lymphatic system provides the movement of fluid continuously flowing into the lymphatic capillaries. Lymph, moving along it, passes through the lymph nodes, in which lymphocytes – lymph cells – retain and destroy bacteria and viruses harmful to the body. All lymphatic vessels of the body are combined into ducts that flow into large veins.
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