part of serous secreting cell tracheobronchial serous cell serous cell of epithelium of bronchus A serous secreting cell that is part of the epithelium of bronchus. https://cellxgene.cziscience.com/cellguide/CL_1000331 FMA:263080 Serous cells of the epithelium of the bronchus, also termed bronchial serous cells, are predominantly found within the seromucous glands located in the bronchial submucosa. Serous cells can also be found in the trachea and are characterized by small, sparse, electron-dense granules. Serous cells are specialized cells responsible for the production and secretion of serous fluid. Serous fluid, mainly composed of water, proteins, and various types of salts, provides many benefits: it helps moisturize the airways, keep the bronchial tube walls moist, and safeguard the bronchial tubes against various foreign particles and infectious agents such as bacteria and viruses. Moreover, the fluid released by these cells assists in the lubrication and reduced friction in the bronchi, allowing for smoother airflow. (This extended description was generated by ChatGPT and reviewed by the CellGuide team, who added references, and by the CL editors, who approved it for inclusion in CL. It may contain information that applies only to some subtypes and species, and so should not be considered definitional.) Homo sapiens epithelium of bronchus