Pulm 5 & 6 Flashcards
1
Q
Gas diffusion Factors
A
- Large surface area
- Short distances
- Gases with advantageous diffusion properties
2
Q
How does the lung respond to an increase in vascular pressure?
A
with a decrease in pulmonary vascular resistance (PVR)
3
Q
Factors influencing lung perfusion
A
- Pulmonary vascular resistance (PVR)
- Gravity
- Alveolar Pressure
- Arterial-venous pressure gradient
4
Q
Perfusion Limited
A
gas equilibrates before the RBC in capillary leaves
5
Q
Diffusion Limited
A
gas is not equilibrated by the time the RBC in the capillary leaves
6
Q
What happens to the alveolar and extra alveolar blood vessels during inspiration?
A
- alveolar blood vessels are compressed
- extra-aveolar blood vessels are pulled open
7
Q
Two reasons for higher blood flow at the base of the lungs
A
- more lung tissue (more capillaries) at the base
- gravity pulls blood into the base more easily
