9: Alveolar Gas Exchange Flashcards
1
Q
Alveolar ventilation
A
Volume of air reaching alveoli
2
Q
Average value of alveolar ventilation
A
4 L / min
3
Q
Perfusion
A
Blood from right ventricle to alveoli
4
Q
Average perfusion
A
5 L / min
5
Q
What is average J for O2 and CO2?
A
O2: 250 ml
CO2: 200 ml
6
Q
Is diffusion of each gas dependent on one another?
A
No, gas diffusion is independent and must be calculated as such
7
Q
Mechanism for measuring a patient’s DL O2
A
- Pt inhales a single breath of air with a v small % of CO added
- CO binds so avidly to Hb that it doesn’t dissolve in plasma
8
Q
What is the correction factor for measuring DL O2
A
1.23
9
Q
Cell type that produces most surfactant
A
Type II pneumocytes
10
Q
Two major components of surfactant
A
- Phospholipids
2. Multiple SP’s (surfactant proteins)
11
Q
Which surfactant protein is most important in function?
A
SPB
12
Q
Where is surfactant stored in cells?
A
Intracellular lamellar bodies
