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PHYSIOLOGY > normal lung alveolar gas exchange > Flashcards

normal lung alveolar gas exchange Flashcards

1
Q

partial pressure of gas in ambient air

A
  • Pgas= Fgas x Patm
  • Pgas = partial pressure of a gas
  • Fgas = concentration of a gas (.21)
  • Patm = atmospheric pressure (760mm Hg)
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2
Q

partial pressure of H2O vapor conducting zone (PH2O)

A
  • 47 mm Hg
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3
Q

partial pressure of of gas in inspired air

A
  • PIgas = Fgas (Patm - PH2O)
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4
Q

partial pressure of O2 in alveolus (PAO2)

A
  • 100 mm Hg
  • gas equation (Patm - 47)fO2- PCO2/R
    (760-47).21-40/.8
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5
Q

partial pressure of CO2 in alveolus (PACO2)

A
  • 40 mm Hg
  • inverse to alveolar ventilation
  • hyper and hypoventilation
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6
Q

partial pressure of O2 in arterial (PaO2)

A
  • 100 mm Hg
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7
Q

partial pressure of CO in arterial (PaCO2)

A
  • 40 mm Hg
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8
Q

partial pressure of O2 in alveolus (PAO2)

partial pressure of O2 in arterial (PaO2)

A

= equals to 100 mm Hg diffusion will take place
is at equilibrium
- SAME CONCEPT IN CO2 = 40 mm Hg

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9
Q

diffuse first out of the capillary O2 or CO2

A
  • CO2 due to its high solubility even thou it has a smaller pressure gradient
  • CO > CO2 > O2 pressure is constant and equal for all
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10
Q

PAO2 is proportional to Patm, fO2 and PaO2

A
  • Patm

- fO2

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11
Q

respiratory zone

A
  • alveoli are found
  • PAO2 = (Patm - 47)fO2- PCO2/R
  • IN THE ALVEOLUS
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12
Q

conducting zone

A
  • PiO2 = (Patm - 47)fO2
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13
Q

diffusion capacity of the lung

A
  • PERFUSION- LIMITED

- DIFFUSION- LIMITED

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14
Q

PERFUSION-LIMITED

A
  • substance EQUILIBRATES between the capillary and interstitium
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15
Q

DIFFUSION-LIMITED

A
  • substance DOES NOT equilibrate between capillary and interstitium
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16
Q

affinity to hemoglobin

A
  • CO > O2 > CO2
17
Q

SOLUBILITY

A
  • CO > CO2 > O2
18
Q

which of the ff gases is best indicated to measure the diffusing capacity of the lung (allow the gases to diffuse at is wall)

A
  • CO
  • carbon monoxide
  • attach to hgb causing partial pressure to be ZERO

PHYSIOLOGY (40 decks)

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