Mucus Production in the Respiratory System: Locations & Functions

Mucus is produced in several parts of the respiratory tract to trap particles and protect airways:

1. Nasal Cavity: Goblet cells secrete mucus to trap dust, pollen, and particles.
2. Trachea and Bronchi: Goblet cells in larger airways capture inhaled foreign particles.
3. Bronchioles: Smaller amounts of mucus protect and moisten these smaller airways.
4. Alveoli: Thin alveolar fluid (with surfactants and mucins) lines gas-exchange surfaces.

Excessive mucus production can signal respiratory conditions (cold, flu, sinusitis, infections) as the body attempts to trap and expel harmful substances.