Week 5: Histology of the Lower Respiratory system

Question 1

What are the 4 types of cells in olfactory epithelium?

Answer 1

Olfactroy receptor, sustentacular, brush, basal

Question 2

What are 4 cell types of resp epithelium?

Answer 2

Ciliated, goblet, brush, basal

Question 3

What is in submucosa of trachea?

Answer 3

Loose CT,submucosal glands, Trachealis muscle, cartilage rings

Question 4

What has a thicker basement mebrane? Trachea or bronchus?

Answer 4

Trachea

Question 5

Difference between submucosa of Bronchus and Bronchiole?

Answer 5

Bronchiole sub - no submucosal glands or cartilage - both have smooth muslce

Question 6

Type 1 alveolar cells

Answer 6

Squamous (cover 95% of surface), 40% cell population, zonula occludens, cannot divide

Question 7

Type 2 alveolar cells

Answer 7

Secrete surfactant, 6-% cell population, Cuboidal (cover 5% surface), maybe divide to become type 1 (if injury)

Question 8

Bloo-air barrier

Answer 8

Alveoli lumen - AIR –> Surfactant, type 1 Alveolar cell, fused basal lamina, endothelial cell —> Capillary lumen

Question 9

Whar are clara cells?

Answer 9

non-ciliated epithelial cells
secrete a surface-active lipoprotein
preventing luminal adhesion if airways collapse.