The study of histological sections of bronchi of various calibers and different ages showed that the number and types of mast cells increase by adolescence and decrease by old age. In all age periods, the bulk of them is type II.

The study of histological sections of the bronchi of various sizes and of different ages showed that the number and types of mast cells grow into adolescence and decline to old age. The second type forms their main mass in all age periods.

It is known that the lung performs very important functions, including gas exchange, lipid metabolism

Serebryakov I.S. Cellular composition and secretory activity of the lung epithelium in normal conditions and with changes in the functional state of the autonomic nervous system: Abstract of the thesis. dis... cand. biol. Sciences. - M., 1984. - 21 p.

Zuta M.V., Nevzorova V.V., Geltser B.I. Mast cells and their importance in the physiology and pathology of the lungs. /Gger.archive - 1999. - sl-80.

Lindner D.P., Poberii I.A., Rozkin M.Ya. Morphometric analysis of mast cell population. //Archive of pathology. 1980. -vol.42, - co-66.

Haies D., Gil G, Weibel ELI Morphometric study 0f rat lung ce11s. IlAmer. Rev. Resp. Dis. - 1981. - Vol. 123. - R.533-567.

Uspensky V.M. Functional morphology of the gastric mucosa, - L.: Nauka, 1986. - 320 p.

Erokhin VV. Functional morphology of the respiratory section of the lungs. - M.: Medicine, 1987. - 272 p.

Sodikova Z. Sh. Dynamics of morphological permutations of extra- and intraorganic vessels and the bronchial tree of the lung in postnatal human ontogenesis: Abstract of the thesis. Dis. Doc. Honey. Sciences. Tashkent 2008, 35s

Mikhailov D. D., Rychakov A. A. Structural and electron microscopic characteristics of the human lung in the embryonic and early fetal periods of prenatal ontogenesis// Actual problems of theoretical, experimental, clinical medicine and pharmacy. Materials of the 51st All-Russian scientific conference of students and young scientists. 2017-Publishing house: RIC "Ivex" .- P.188-189.