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The Respiratory Epithelium

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Physiology of Membrane Disorders

Abstract

The respiratory epithelium forms a continuous layer of cells that separates air from liquid throughout the lung. The integrity and function of the epithelium are a critical requirement for effective gas exchange, the uptake of O2 from the environment and elimination of CO2 from the organism. Transfer of gases between the air and the blood requires two anatomical structures: the conducting airways, which distribute the inspired air within the lungs, and the alveoli, which are the site of O2 and CO2 diffusion between the gas phase and the pulmonary capillary blood. The epithelia in both regions serve as passive barriers between gas and fluid phases and perform active ion transport functions. In the airways, the epithelium can actively secrete Cl- or absorb Na+; ion transport is an important determinant of the quantity and composition of the respiratory tract fluid, an essential component of mucociliary clearance. In the alveoli, the epithelium actively absorbs Na+; Na+ absorption is a major factor that maintains a fluid–free alveolus. In the fetal lung, the epithelium actively secretes Cl-; fluid secretion is a major requirement for normal pulmonary growth and development.

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Welsh, M.J. (1986). The Respiratory Epithelium. In: Andreoli, T.E., Hoffman, J.F., Fanestil, D.D., Schultz, S.G. (eds) Physiology of Membrane Disorders. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-2097-5_41

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