Lab7 - Respiratory System

Question 1

What are the 3 zones of the respiratory system?

Answer 1

1. Conducting Zone:
   - Nasal cavity, Larynx Trachea, Bronchi, Regular Bronchioles, Terminal Bronchiole
   - Cleans, warms, moistens air
   - Cartilage and smooth muscle
   - No gas exchange
2. Transitional Zone:
   - Only respiratory bronchioles
   - smooth muscle, NO cartilage
   - Some gas exchange
3. Respiratory Zone:
   - Alveolar ducts, alveolar sacs, alveoli
   - No cartilage, little smooth muscles
   - GAS EXCHANGE

Question 2

How is the typical respiratory epithelium classified?

Answer 2

Pseudostratified columnar ciliated epithelium with Goblet cells

Question 3

What are the layers of tissue lining the trachea?

Answer 3

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

Question 4

What are the layers of tissue lining the Intrapulmonary Bronchus like?

Answer 4

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)

Question 5

What are the layer of the tissue lining the regular bronchioles like?

Answer 5

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

Question 6

What are the layers of tissue lining the Terminal Bronchiole like?

Answer 6

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