Physiology Review Slides Lec. 21 Flashcards
Alveolar pressure measurement During INSPIRATION
0 -> -1 cm H2O
- Negative pressure draws in the air
Alveolar pressure
Pressure of air inside the Alveoli
Dalton’s Law
The TOTAL Pressure Exerted by a Mixture of NON-reactive gasses is EQUAL to the Sum of the PARTIAL PRESSURES if the Individual gasses
Minute Venitilation
The total Volume of gasses moved INTO and OUT of the Lungs per Minute
Alveolar pressure measurement During EXPIRATION
0 -> +1 cm H2O
- Build-up of Pressure leads to the air moving OUT
Minute Ventilation Equation
(Breaths per Min) x (Tidal Volume)
- 16BPM x 500ml
= 8000ml/min
Alveolar Ventilation Equation
(BPM) x (Tidal Volume - DEAD Space)
- (16) x (500-150)
= (16) x (350)
= 5600ml/min
Boyle’s Law
For a Fixed amount of Ideal gas kept at a Fixed TEMP
- Pressure and Volume are INVERSELY Proportional
- P/V
Pleural pressure measurement During INSPIRATION
-> -5 to -7.5 cm H2O
Gets MORE Negative
Alveolar Ventilation
The Volume of gases that Enter spaces Participating in GAS EXCHANGE per minute.
Pleural pressure measurement During EXPIRATON
- > -7.5 to -5 cm H2O
- Becomes MORE Positive
What happens to the Atmospheric partial pressures when at the Alveoli and saturated with 6.18% Water Vapor?
All the partial pressures Decrease
Henry’s Law
At a constant Temp, the amount of a given gas dissolved in a liquid is DIRECTLY Proportional to the Partial Pressure of that gas in EQUILIBRIUM with that liquid
- More Soluble a gas is, the LESS effect on Partial pressure
Pleural Pressure
Pressure of the FLUID in the space b/w the Visceral and Parietal pleura
Alveolar pressure and Pleural pressure are measured in what units?
Cm H2O
