لخّصلي

1.The movement of the columnar cell cilia removes this mucus from the airways in the opposite direction to the inhaled air, to the oral cavity.As the airways branch and the bronchial diameter decreases, the height of the epithelial cells decreases, the number of goblet cells decreases, and then the number of cilia also decreases.Among them, two types of cells are distinguished: some are immature cells, which can give rise to ciliated or goblet cells; the others have nerve endings on their basal surface and are able to perform a receptor function.Small granule cells, resembling basal cells, but contain numerous cytoplasmic granules.Respiratory mucosa is composed of respiratory epithelium and lamina propria. 2)- pseudostratified columnar ciliated epithelium with goblet cells.Ciliated columnar cells predominate in the respiratory epithelium.

1. Respiratory mucosa is composed of respiratory epithelium and lamina propria. Respiratory epithelium (pic. 2)- pseudostratified columnar ciliated epithelium with goblet cells. It lines most of the airways. As the airways branch and the bronchial diameter decreases, the height of the epithelial cells decreases, the number of goblet cells decreases, and then the number of cilia also decreases. Types of epithelial cells. Ciliated columnar cells predominate in the respiratory epithelium. Each cell has about 300 mobile cilia on the apical surface, associated with basal bodies in the apical part of the cytoplasm (remember how cilia are arranged). Goblet cells are the next numerous types of epithelial cells. They produce a mucous secret that covers the epithelium, removes bacteria and foreign particles from the inhaled air. The movement of the columnar cell cilia removes this mucus from the airways in the opposite direction to the inhaled air, to the oral cavity. Brush cells are columnar, but lack of cilia and often have microvilli on the apical surface. Among them, two types of cells are distinguished: some are immature cells, which can give rise to ciliated or goblet cells; the others have nerve endings on their basal surface and are able to perform a receptor function. Small granule cells, resembling basal cells, but contain numerous cytoplasmic granules. They are endocrine cells of the diffuse neuroendocrine system (DNES). Basal cells are small round cells that are located on the basal plate and do not reach the apical surface. They may be stem cells that give rise to other cell types of respiratory epithelia. Small granule cells