Lab7 - Respiratory System Flashcards
What are the 3 zones of the respiratory system?
- Conducting Zone:
- Nasal cavity, Larynx Trachea, Bronchi, Regular Bronchioles, Terminal Bronchiole
- Cleans, warms, moistens air
- Cartilage and smooth muscle
- No gas exchange - Transitional Zone:
- Only respiratory bronchioles
- smooth muscle, NO cartilage
- Some gas exchange - Respiratory Zone:
- Alveolar ducts, alveolar sacs, alveoli
- No cartilage, little smooth muscles
- GAS EXCHANGE
How is the typical respiratory epithelium classified?
Pseudostratified columnar ciliated epithelium with Goblet cells
What are the layers of tissue lining the trachea?
Mucosa: Resp epithelium + Lamina propria (loose CT)
Submucosa: Dense irregular CT, glands (serous and mucous), C-ring of Hyaline Cartilage, Trachealis muscle + other smooth muscle
Aventitia: Dense irregular CT
What are the layers of tissue lining the Intrapulmonary Bronchus like?
Mucosa:
- Wavy resp. epithelium
- Fewer goblet cells
- LP is highly vascularized
Submucosa:
- Plates of hyalin cartilage (no C-rings)
- Smooth muscle, Dense irregular CT, S and M glands
Adentitia:
- Dense irregular CT mixed with lung tissue (intrapulmonary)
What are the layer of the tissue lining the regular bronchioles like?
Mucosa:
- Simple ciliated columnar epithelium
- NO goblet cells
- Wavy epithelium from contraction of smooth muscle
- Thin lamina propria
Submucosa:
- Lots of smooth muscles (2 layers)
- NO cartilage or glands
Adventitia:
- Hard to distinguish, Very thin and mixed with lung
What are the layers of tissue lining the Terminal Bronchiole like?
Mucosa:
- Continuous layer of simple ciliated cuboidal cells + non-ciliated cuboidal cells (CLUB cells)
- less wavy (bc less smooth muscles)
- Lamina Propria nearly absent
Submucosa:
- Little smooth muscle, wall is intact, no cartilage, no glands
Adentitia → Can’t distinguish