Lecture 24 - Pulmonary Gas Exchange Flashcards
What are the four major components of atmospheric air?
Nitrogen (78%), Oxygen (21%), argon (0.1%) and CO2 (0.03%)
The total pressure of a gas is equal to the _______.
sum of their partial pressures; Dalton’s law
For a fixed volume of gas at a fixed temperature, volume is _____.
inversely proportional to pressure; Boyle’s law
At a constant temperature, the amount of a gas that dissolves is directly proportional to the ____.
partial pressure of that gas; Henry’s law
The calculate the partial pressure of a gas, the ideal gas equation is rearranged to __________.
P=nRT/V
To determine partial pressure of a gas, multiply the pressure in Torr (760 Torr = 1 atm) by____.
the decimal percentage of the gas
The partial pressure of O2 at the alveolar membrane is?
150 mmHg (760 Torr x 0.197)
According to Henry’s law, the partial pressure of a dissolved gas is inversely proprtional to its:
solubility coefficient; if it is less soluble, it will have a lower partial pressure, as it does not dissolve readily
The partial pressure exerted from the escape of a gas from the liquid phase
A. partial pressure of sublimation
B. vapor pressure
C. solubility coefficient
B. vapor pressure
Upon exchange of gas in the alveoli, what components increase?
Carbon dioxide and water
Upon exchange of gas in the alveoli, what components decrease?
oxygen
Diffusion of a gas into a liquid is inversely proportional to?
distance of diffusion, sqrt(molecular wieght)
Diffusion of a gas into a liquid is directly proportional to?
partial pressure difference in pathway, cross sectional area to diffuse, solubility of the gas
Approximately ____ mL of new air is brought into the alveoli with each inspiration.
A. 100
B. 250
C. 350
D. 500
C. 350
The [O2]blood is controlled by what two factors?
Rate of absorption into the blood; rate of alveolar ventilation
