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Alveolar capillary membrane questions

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Alveolar Capillary Diffusion

Alveolar Capillary Diffusion

Question 1 of 6

1

Regarding the alveolar-capillary diffusion

Select one of the following:

  • 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

Explanation

Question 2 of 6

1

O2 and CO2 are equally the same in solubility

Select one of the following:

  • True
  • False

Explanation

Question 3 of 6

1

Diffusion rate - which of the following is not true

Select one of the following:

  • 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

Explanation

Question 4 of 6

1

High altitudes can decrease the oxygen pressure gradient --> less O2 will diffuse into the blood because now there's a lower driving pressure

Select one of the following:

  • True
  • False

Explanation

Question 5 of 6

1

Diffusion capacity of lung - different gases

Select one of the following:

  • CO is purely diffusion limited

  • N2O is purely perfusion limited

  • O2 is mixed (mainly perfusion limited)

  • all of the above are correct

Explanation

Question 6 of 6

1

all of the following will decrease DLCO (diffusion of CO) except?

Select one of the following:

  • anemia

  • pulmonary fibrosis

  • emphysema

  • Polycythemia

Explanation

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