Tiger1974
Forum Newbie
Topics: 12
Posts: 18
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1. If a resting individual at the sea level doubles his alveolar ventilation what would be his arterial Pco2?
a. same as in the alveoli
b. 120 mm Hg
c. 100 mm Hg
d. 80 mm Hg
e. 40 mm Hg
2. In a person described above, what will be his mixed venous Pco2?
a. same as in the alveoli
b. 120 mm Hg
c. 100
d. 80
e. 40
3. What is a partial pressure of oxygen in a hyperbaric chamber, which contains pressurized ambient air at 2 atm?
a. 1520 mm Hg
b. 760
c. 300
d. 160
e. 100
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| Leopard
Forum Guru
Topics: 30
Posts: 401
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1: Same as in alveoli .And it will be half of normal i.e PCO2 = 40/2 = 20 mm of Hg
2:None of them is correct.Normally Arterial PCO2 = 40 mm of Hg and venous PCO2 = 46 mm of Hg
So every time 6mm of Hg of PCO2 is added to arterial blood from metabolism .Since PaCO2 is 20 mm of Hg ,it must be 26mm of Hg in the venous blood
3: O2 pressure = Fraction of O2 x Total pressure
= .21x1520 = 319 mm of Hg = choice C.
Best of luck
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