Structure of Human Ventilation System 3

—> in the trachea and bronchi, there are ciliates epithelial cells and goblet cells and together these form mucus membranes

1. Goblet cells produce mucus
2. Goblet cells secrete the mucus by exocytosis
3. Mucus traps any pathogens in the air that had been breathed in
4. Cilia on the ciliate’s epithelial cells beat in a rhythmic manner to waft the mucus up the reaches to the mouth away from the lungs

—> components that contain goblet cells

• trachea 
• bronchi 

—> where you would find elastin

• alveoli = in the walls 

—> structure that prevents friction

• serous membrane that line the lungs and inside of body cavity -> pleural membranes 

—> function of cartilage

• allows air to travel in/out of each lung 

—> component that narrows airways

• smooth muscles