Alveolar Capillary Diffusion

radven
Quiz by radven, updated more than 1 year ago
radven
Created by radven over 6 years ago
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Description

Alveolar capillary membrane questions

Resource summary

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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