Module 7 Flashcards
What is the function of the conducting portion of the respiratory system?
Warms and moistens air
What are the characteristics of the conducting respiratory portion?
Airways decrease in diameter
Trachea and bronchi have bone or cartilage
Pseudostratified ciliated columnar epithelium with goblet cells
Elastin in lamina propria of bronchi
Mucoserous glands in mucosa of bronchi
Simple ciliated columnar epithelium in bronchioles
Prominent smooth layer in bronchioles
What is the function of the respiratory portion of the respiratory system?
Gas exchange
What are the characteristics of the respiratory bronchioles?
Some small single alveoli
No goblet cells
Ciliated cuboidal cells and nonciliated Clara cells
What is the function of Clara cells?
Produce surfactant
Act as stem cells
Detoxify noxious substances
What are the characteristics of the alveolar components?
Smooth muscle associated with collagen and elastic fibres
Surrounded by pulmonary capillaries
Alveolar septum between alveoli have ports to equalize pressure
What are the alveolar tissue components?
Epithelium- flattened cells
Connective tissue- reticular, collagenous
Blood vessels
What are the different epithelial cells of the alveoli?
Type I pneumocytes- gas exchange
Type II pneumocytes- surfactant secretion
Where are alveolar macrophages/dust cells located?
Alveolar wall or space
What are the two portions of the respiratory system? What structures belong to both?
Conducting- nasal cavities, nasopharynx, larynx, trachea, bronchi and bronchioles
Respiratory- respiratory bronchioles, alveolar ducts, alveolar sacs and alveoli
