Lung microanatomy

Question 1

delineate and recognize the layers of the walls of the conduction system :
Bronchus - terminal bronchioles:

Answer 1

Bronchus - terminal bronchioles:
Pseudostratified Ciliated columnar cell layer on lumenal side of epithelium + goblet cells → thin basal lamina → lamina propria (lymphoids) →smooth muscle → sub mucosa →cartilage → adventitia

basal cells (progenitor of goblet)

Question 2

delineate and recognize the layers of the walls of the conduction system :
respiratory bronchioles

Answer 2

Cuboidal cells / club cells/ clara cells→ thin basal lamina → lamina propria (lymphoids) →smooth muscle → sub mucosa →→ adventitia

*lose cartilage, pseudo becomes clara

Question 3

If you poke a pin thru the alveolus and into a RBC how many layers will it take? name them

Answer 3

5 layers

2 pneumocyte membranes → 2 endothelial cell membranes that line the capillary → into RBC memb

Question 4

What does the smooth muscle demarcate in the bronchiole?

Answer 4

it demarcates the mucosa from the submucosa