3493311
Question 1
Question
Regarding the alveolar-capillary diffusion
Answer
-
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
-
Partial pressure of gas = gas tension
-
all of the above are correct
Question 2
Question
O2 and CO2 are equally the same in solubility
Answer
- True
- False
Question 3
Question
Diffusion rate - which of the following is not true
Answer
-
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
Question 4
Question
High altitudes can decrease the oxygen pressure gradient --> less O2 will diffuse into the blood because now there's a lower driving pressure
Answer
- True
- False
Question 5
Question
Diffusion capacity of lung - different gases
Answer
-
CO is purely diffusion limited
-
N2O is purely perfusion limited
-
O2 is mixed (mainly perfusion limited)
-
all of the above are correct
Question 6
Question
all of the following will decrease DLCO (diffusion of CO) except?
Answer
-
anemia
-
pulmonary fibrosis
-
emphysema
-
Polycythemia
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