Gas Transport in Airways Flashcards
What is barometric pressure?
sum of all partial pressures of components of air
what is partial pressure?
the amount of pressure all the molecules of a certain gas exert on a container
What is the equation for Dalton’s Law?
PI02 = (PB - 47 torr) X FO2
What is the PIO2 at sea level?
150 torr
What is the PIO2 in denver?
121 torr
What is the alveolar gas equation?
PAO2 = (PB - 47)FIO2 - (PaCO2/R)
What is the value of R in the alveolar gas equation?
0.8
What makes the R value in the alveolar gas equation change?
diet
What is an ideal PaCO2?
40 torr
What is faster, ventilation or diffusion?
diffusion is FAST ventilation is SLOW
what is the rate limiting step for removal of CO2 from the blood?
ventilation time
What is the alveolar ventilation equation?
PaCO2 = (minute VCO2/ minute VA) x K
- minute VCO2 = amount of CO2 produced in 1 minute
- minute VA = alveolar vent rate in 1 minute
What is the relationship between blood CO2 and alveolar ventilation?
Blood CO2 is DIRECTLY regulated by alveolar ventilation
what is the relationship between blood O2 and alveolar ventilation?
Blood O2 is INDIRECTLY regulated by alveolar ventilation via its affects on alveolar CO2
If alveolar ventilation is decreased by 50% what happens to arterial CO2?
arterial CO2 will double based on the Alveolar ventilation equation (PaCO2 = (minute VCO2/ minute VA) x K
