Bronchus <2024-2026>

Involuntarily controlled muscle that regulates airflow by contracting (bronchoconstriction) or relaxing (bronchodilation).

The "mucociliary escalator" uses rhythmic ciliary motion to push mucus and trapped particles upward toward the pharynx for clearance. bronchus

Hyaline cartilage provides structural support to keep the airways open during the pressure changes of breathing. bronchus

These supply each lobe of the lung (three on the right, two on the left). bronchus

Acts as a passageway for air moving from the trachea to the smaller bronchioles and eventually the alveoli for gas exchange.