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8 Cards in this Set
- Front
- Back
4 gases normally contained in the alveoli:
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Carbon dioxide, oxygen, water vapor, nitrogen
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PAN2:
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Alveolar nitrogen pressure:
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PAN2:
(formula): |
PAN2= PB - (PAO2 + PACO2 + PH2O)
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Breathing room air at sea level, during hyperventilation, a PAO2 > ___ to ___ mmHg:
would be ________: |
120-130 would be abnormal
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The barrier to gaseous diffusion in the lung is the:
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Alveolar- capillary membrane
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The A-C membrane consists of:
(The 3* barriers to gaseous diffusion) |
1.Alveolar epithelium (alveolar membrane)
2. Interstitial space. 3. Capillary endothelium (capillary membrane) * and sometimes the erythrocyte membrane |
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The bulk of movement of a gas through a biological membrane is described by Fick's 1st law of diffusion:
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Vgas = (A x D) / T x (P1 - P2)
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Fick's law formula:
A: D: T: P1 - P2: |
A. equals the cross-sectional area available for diffusion.
D: the diffusion coefficient of the gas T: the thickness of the membrane P1- P2: the partial pressure gradient across the membrane |