Alveolar destruction & +++ pulmonary artery press. Flashcards
True or false type two respiratory failure is any cause of inadequate ventilation?
True
What’s diffuses easier across the alveolar membrane: CO2 or O2?
CO2
Approximately how many alveoli do you have in your lungs?
200 to 300 million
What four things are the alveolar capillary membrane composed of?
Player of surfactant
type alveolar cell
basement membrane
vascular endothelial cell
How thick is the alveoli – capillary membrane?
2 cells thick
What is the average surface area for diffusion of gases in the lungs?
75 m2
Why are the lungs ideally suited for gas exchange?
Large surface area and thinness
3 physiological effects of disrupting the a – c membrane?
- abnormal gas exchange
2 abnormal lung mechanics
3 pulmonary vascular complications
What does Fick’s law determine??
Rate of diffusion of the gas
Should there be a limitation in diffusion of oxygen in a normal person at maximum exercise?
Nope. only perfusion limited
When would you get a diffusion limitation of oxygen transfer? 2 situations
at rest if abnormal A-C membrane
during exercise if less severe disease
How much faster does CO2 diffuse out compared to O2?
20x faster
When is one of the only times he would get a high PaCO2?
low ventilation ie. type 2 reap failure
How is emphysema an exception in the restrictive lung disease category?
It has increased lung compliance not stiffer
What is the pattern of breathing for restrictive lung diseases?
Short and shallow rate