3493311
Pregunta 1
Pregunta
Regarding the alveolar-capillary diffusion
Respuesta
-
The atrial pressure of O2 or CO2 in blood is due to the gas that is dissolved in plasma
-
Once an O2 or CO2 gas molecule binds to hemoglobin it no longer contributes to the partial pressure of the gas
-
Once equilibrium between alveolar and capillary is reached, there is no more diffusion
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Partial pressure of gas = gas tension
-
all of the above are correct
Pregunta 2
Pregunta
O2 and CO2 are equally the same in solubility
Respuesta
- True
- False
Pregunta 3
Pregunta
Diffusion rate - which of the following is not true
Respuesta
-
Directly proportional to the area, solubility and driving pressure
-
Inversely proportional to the thickness or distance
-
Loss of capillaries and alveoli will increase area and decrease distance
-
Concentration difference will affect the driving pressure
Pregunta 4
Pregunta
High altitudes can decrease the oxygen pressure gradient --> less O2 will diffuse into the blood because now there's a lower driving pressure
Respuesta
- True
- False
Pregunta 5
Pregunta
Diffusion capacity of lung - different gases
Respuesta
-
CO is purely diffusion limited
-
N2O is purely perfusion limited
-
O2 is mixed (mainly perfusion limited)
-
all of the above are correct
Pregunta 6
Pregunta
all of the following will decrease DLCO (diffusion of CO) except?
Respuesta
-
anemia
-
pulmonary fibrosis
-
emphysema
-
Polycythemia
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