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Bronchial Secretion
- Molecular classification
- Mixture, Mucus, Fluid
01
Overview
Bronchial secretion is the mixture of mucus and serous fluid produced by the cells lining the bronchial airways. This secretion is a critical component of the innate defense system in the respiratory tract, serving to protect airway surfaces from pathogens, environmental toxins, and inhaled particulates. It is composed of water, mucins (MUC5AC and MUC5B), free proteins, antibacterial proteins/peptides, and surfactant components. While essential for airway health, excessive or impaired bronchial secretion contributes to the morbidity of diseases such as asthma, COPD, and cystic fibrosis.
- Other names
- Airway MucusRespiratory SecretionSputum
02
Biological functions
Airway protectionPathogen clearanceParticle trappingMucociliary clearanceAirway hydration
03
Disease associations
AsthmaCOPDCystic FibrosisPneumoniaAtelectasis
04
Safety considerations
Airway obstructionIncreased risk of infectionImpaired gas exchange
05
Biomarkers
Mucin concentrationSputum volumeMUC5AC levelsMUC5B levels
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