-
Nasal cavity epithelium
- 2 types:
- stratified squamous- air enters
- pseudostratified ciliated- remainder
-
Trachea
- Ciliated, pseduostratified columnar
- has goblet cells, basal bodies
- Also has these cells: brush cell- receptor cell connected to sympathetic afferent nerve; small granule cell- eneteroendocrine
-
Bronchus
- cartilage plates
- Spiral band of sm m running in opp directions to keep airway open
- submucosal glands
-
Bronchiole
- transitions from columnar -> CUBOIDAL
- NO cartilage
- NO glands
- sm. m
- Decrease ciliated cells; goblet cells
- Some Clara cells
- reuction in "fluid producing" cells
- ASTHMA
-
Terminal bronchioles
- Ciliated cuboidal
- NO goblet cells
- Sm m layer thinner, irreg. shaped lumen
- Many Clara cells
- CF
-
Respiratory bronchioles
- lined by squamous epithelium
- presence of thin-walled outpocketings (alveoli)
-
Alveoli
- Type I cells (type I pneumocytes):
- squamous, thin nucleus, thinness for max gas Xchange
- Type II cells (type II pneumocytes):froathy cytoplasm (vaculated)
- site for surfactant production
- pyrimidal shape
-
Surfactant
- [hi] of dipalmitoyl lecithin
- Lamellar bodies in type II- storage site for surfactant
- Clara cells contribute some
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