A&P Lab Ch 21

Bronchioles

passages in the respiratory tract smaller than 1 mm in diameter

Muscularis

not a layer of tissue in the respiratory tract

Proper order of respiratory tract

1. nasal cavity 2. nasopharynx 3. oropharynx 4. laryngopharynx 5. larynx 6. trachea 7. bronchi 8. bronchiole 9. terminal bronchiole 10. respiratory bronchiole 11. alveolar sac

3 structures that constitute the respiratory membrane

1. squamous epithelial 2. endothelial cells of pulmonary arteries 3. shared basal lamina

3 trends we find within the respiratory tract

1. the epithelium gets progressively shorter in the lower passages 2. the amount of smooth muscle increases in the smaller passages 3. the amount of elastic fibers increases in the smaller passages

Respiratory Zone

gas exchange takes place

The ____ is the lungs' outer membrane, which adheres to the inner wall of the thoracic cavity.

parietal pleura

Conducting Zone

passage that conducts air to lower passages

Between the two layers of membrane is the ___.

pleural cavity

Epiglottis

the piece of elastic cartilage that seals off the larynx during swallowing

At the lungs' root, it folds inward on itself to become the inner membrane called the ____, which adheres to the lungs' surface.

visceral pleura