Respiratory Histology

Question 1

What is the conducting portion of the RT?

Answer 1

Nasal cavities, Nasopharynx, Layrnx, Trachea, Bronchi, Primary bronchioles

Question 2

What is the respiratory portion of the RT?

Answer 2

Secondary bronchioles, alveolar ducts, alveolar sacs, alveoli

Question 3

What kind of epithelium lines most of the RT?

Answer 3

pseudostratified columnar ciliated (PSCC)

Question 4

What is the structure of the trachea?

Answer 4

PSCC with goblet cells lining, Horse-shoe cartilage rings with trachealis muscle to close the loop (smooth muscle)

Question 5

What is the structure of the main bronchus?

Answer 5

PSCC with goblet cells lining, Cartilage begins as complete rings and then transitions to incomplete as it moves distally, spiral smooth muscle

Question 6

What is the structure of the bronchioles?

Answer 6

<1mm diameter, simple columnar/cuboidal epithelium, no glands or cartilage, prominent smooth muscle

Question 7

What are the funcitons of the 2 types of cells in alveoli?

Answer 7

type 1 - gas exchange

type 2 - surfactant production