Immunity refers to the body’s ability to find foreign bodies and substances (antigens) and get rid of them. The immune system includes the bone marrow, where blood cells are formed, the pitchfork gland (thymus), lymph nodes, spleen, accumulation of lymphoid tissue along the respiratory tract and digestive organs. In the latter, lymphocytes that form in the bone marrow mature. The functions of the lymphocytes of the thymus and lymph nodes are somewhat different and complement each other. Distinguish between cellular immunity, in which the destruction of foreign bodies is carried out by cells, such as phagocytes, and humoral immunity, in which foreign bodies are removed using antibodies, chemicals delivered by blood. Cellular immunity was discovered by I.I. Mechnikov, and humoral – P. Erlich. The Nobel Prize was awarded to both of them.
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