CHAPTER 12 EGAN'S TESTBANKS.
EXAM 2025/2026 QUESTIONS AND
ANSWERS 100% PASS
Gaseous diffusion
- ANS 1 and 3 only
6. Under what conditions will the alveolar PACO2 rise above normal?
a.
If both metabolic rate and ventilation increase (e.g., through exercise)
b.
If carbon dioxide production decreases relative to VA
c.
If VA decreases relative to carbon dioxide production
d.
When the patient is febrile - ANS If VA decreases relative to carbon dioxide production
7. A 70-kg male patient has a CO2 of 200 ml/min and a VA of 9 L/min. From this information,
what can you infer?
a.
The patient's carbon dioxide production is abnormally low.
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,b.
The patient's A is abnormally low.
c.
The patient will have a lower than normal PACO2.
d.
The patient will have a higher than normal PACO2. - ANS The patient will have a lower than
normal PACO2.
8. What is the primary determinant of the PAO2?
a.
Body's CO2
b.
Metabolic rate of the body tissues
c.
PaO2
d.
PO2 in the inspired gas - ANS PO2 in the inspired gas
9. The PAO2 depends on which of the following factors?
1. Ambient (atmospheric) pressure
2. Fractional concentration of inspired O2
3. Level of VA
4. Types of fuels burned (fat, protein, and carbohydrate)
a.
1, 2, and 3 only
b.
1 and 2 only
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,c.
3 only
d.
1, 2, 3, and 4 - ANS 1, 2, 3, and 4
10. Calculate the approximate PAO2 given the following conditions (assume R = 0.8): FiO2 = .40,
PB = 770 mm Hg, PACO2 = 31 mm Hg
a.
100 mm Hg
b.
135 mm Hg
c.
250 mm Hg
d.
723 mm Hg - ANS 250 mm Hg
11. A healthy person breathing 100% O2 at sea level would have PAO2 of approximately what
level?
a.
149 mm Hg
b.
670 mm Hg
c.
713 mm Hg
d.
760 mm Hg - ANS 670 mm Hg
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, 12. Which of the following best represents the partial pressures of all gases in the normally
ventilated and perfused alveolus when breathing room air at sea level?
a.
PO2 = 40 mm Hg; PCO2 = 100 mm Hg; PN2 = 573 mm Hg; PH2O = 47 mm Hg
b.
PO2 = 100 mm Hg; PCO2 = 40 mm Hg; PN2 = 573 mm Hg; PH2O = 47 mm Hg
c.
PO2 = 100 mm Hg; PCO2 = 40 mm Hg; PN2 = 713 mm Hg; PH2O = 47 mm Hg
d.
PO2 = 149 mm Hg; PCO2 = 40 mm Hg; PN2 = 573 mm Hg; PH2O = 47 mm Hg - ANS b.
PO2 = 100 mm Hg; PCO2 = 40 mm Hg; PN2 = 573 mm Hg; PH2O = 47 mm Hg
13. In a person breathing room air (and with all else being normal), if the alveolar PCO2 rises
from 40 to 70 mm Hg, what would you expect?
a.
PAO2 to fall by approximately 30 mm Hg
b.
PAO2 to fall by approximately 40 mm Hg
c.
PAO2 to rise by approximately30 mm Hg
d.
PAO2 to rise by approximately 40 mm Hg - ANS PAO2 to fall by approximately 30 mm Hg
14. Assuming a constant FiO2 and carbon dioxide production, which of the following
statements is correct?
a.
An increased PACO2 will result in and increased PAO2.
b.
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EXAM 2025/2026 QUESTIONS AND
ANSWERS 100% PASS
Gaseous diffusion
- ANS 1 and 3 only
6. Under what conditions will the alveolar PACO2 rise above normal?
a.
If both metabolic rate and ventilation increase (e.g., through exercise)
b.
If carbon dioxide production decreases relative to VA
c.
If VA decreases relative to carbon dioxide production
d.
When the patient is febrile - ANS If VA decreases relative to carbon dioxide production
7. A 70-kg male patient has a CO2 of 200 ml/min and a VA of 9 L/min. From this information,
what can you infer?
a.
The patient's carbon dioxide production is abnormally low.
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,b.
The patient's A is abnormally low.
c.
The patient will have a lower than normal PACO2.
d.
The patient will have a higher than normal PACO2. - ANS The patient will have a lower than
normal PACO2.
8. What is the primary determinant of the PAO2?
a.
Body's CO2
b.
Metabolic rate of the body tissues
c.
PaO2
d.
PO2 in the inspired gas - ANS PO2 in the inspired gas
9. The PAO2 depends on which of the following factors?
1. Ambient (atmospheric) pressure
2. Fractional concentration of inspired O2
3. Level of VA
4. Types of fuels burned (fat, protein, and carbohydrate)
a.
1, 2, and 3 only
b.
1 and 2 only
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,c.
3 only
d.
1, 2, 3, and 4 - ANS 1, 2, 3, and 4
10. Calculate the approximate PAO2 given the following conditions (assume R = 0.8): FiO2 = .40,
PB = 770 mm Hg, PACO2 = 31 mm Hg
a.
100 mm Hg
b.
135 mm Hg
c.
250 mm Hg
d.
723 mm Hg - ANS 250 mm Hg
11. A healthy person breathing 100% O2 at sea level would have PAO2 of approximately what
level?
a.
149 mm Hg
b.
670 mm Hg
c.
713 mm Hg
d.
760 mm Hg - ANS 670 mm Hg
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, 12. Which of the following best represents the partial pressures of all gases in the normally
ventilated and perfused alveolus when breathing room air at sea level?
a.
PO2 = 40 mm Hg; PCO2 = 100 mm Hg; PN2 = 573 mm Hg; PH2O = 47 mm Hg
b.
PO2 = 100 mm Hg; PCO2 = 40 mm Hg; PN2 = 573 mm Hg; PH2O = 47 mm Hg
c.
PO2 = 100 mm Hg; PCO2 = 40 mm Hg; PN2 = 713 mm Hg; PH2O = 47 mm Hg
d.
PO2 = 149 mm Hg; PCO2 = 40 mm Hg; PN2 = 573 mm Hg; PH2O = 47 mm Hg - ANS b.
PO2 = 100 mm Hg; PCO2 = 40 mm Hg; PN2 = 573 mm Hg; PH2O = 47 mm Hg
13. In a person breathing room air (and with all else being normal), if the alveolar PCO2 rises
from 40 to 70 mm Hg, what would you expect?
a.
PAO2 to fall by approximately 30 mm Hg
b.
PAO2 to fall by approximately 40 mm Hg
c.
PAO2 to rise by approximately30 mm Hg
d.
PAO2 to rise by approximately 40 mm Hg - ANS PAO2 to fall by approximately 30 mm Hg
14. Assuming a constant FiO2 and carbon dioxide production, which of the following
statements is correct?
a.
An increased PACO2 will result in and increased PAO2.
b.
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