Respiratoy Tissues Flashcards
Mucosa of the trachea:
Pseudo-stratified tall columnar epithelium with cilia and goblet cells, supported by lamina propria
Trachea submucosa
Connective tissue
Seromucinous glands producing mucus and water and humidity
Trachea : cartilaginous layer
Separated by smooth muscle - gives shape and helps to maintain structure
Adventitia
Outermost layer of connective tissue
Bronchi mucosa
Lamina propria becomes more elastic and separated from submucosa by a layer of smooth muscle
Bronchi submucosa
Goblet cells and seromucinous glands decrease - less particles to catch
Bronchi Cartilaginous layer
Irregular flattened plates
Bronchioles mucosa
Clara cells replace much of ciliated epithelium
Bronchioles submucosa
Walls are smooth muscle
Bronchioles cartilage
NO CARTILAGE IN THEIR WALLS
Bronchiole epithelium
Ciliated columnar
What are Clara cells ?
Non-ciliated, secretory cells. Assist in the production of surfactant
Type I pneumocytes
- Sqauamos epithelium - covering 95% of alveolar surface
- Form extremely thin gaseous diffusion barrier
- nuclei = small and dense. Infrequently seen in section
Type II pneumocytes
- Produce surfactant - preventing collapse of alveoli
- Large nuclei
