Gas Exchange Flashcards
1
Q
Causes dilution of gasses in the upper resp
A
Humidification
2
Q
Partial pressures of inspired air
A
Total 760 N2: 601 O2: 159 CO2 0.3 H20: variable
3
Q
Occurs if humidification of air does not occur
A
Lung tissue damage or infection
4
Q
Pp of H20 in alveoli
A
47 mm Hg
5
Q
Pp flow of 02
A
o 159 mm inspired o 105 alveoli o 100 arterial o 40 systemic tissue o 40 veins
6
Q
Pp flow of CO2
A
o 0.3 mm Inspired o 40 alveoli o 40 artery o 45 systemic tissue o 45 veins
7
Q
Increased contact area with RBCs in alveolar capillaries
A
Thin walls
8
Q
Layers of the resp membrane
A
- Fluid + surfactant
- Alveolar epithelium
- Basement membrane of epithelium
- Thin interstitial space
- Basement membrane of capillary
Capillary endothelium
9
Q
Factors influencing diffusion across resp membrane
A
- Thickness (edema, fibrosis)
- Surface area
- Diffusion constant (co2 more rapid than 02)
- Pressure difference
10
Q
Where oxygen is in transport
A
- 98.5% hemoglobin
- 1.5% dissolved in blood
11
Q
Where oxygen binds
A
To the heme (fe) group on hemoglobin, up to 4. Now oxyhemoglobin
12
Q
02 sat in arteries compared to veins
A
100% art, 80% vein
13
Q
The oxy chart shift to the right means….
A
More 02 removal
14
Q
the oxy chart shift to the left means
A
Less 02 removal
15
Q
Causes more 02 removal
A
- Decrease in pH
- Increase in temp
- Increase in CO2
