Author Question: What is the highest PAO2 one could expect to observe in an individual breathing room air at sea ... (Read 55 times)

justinmsk · **on:** Jul 16, 2018

What is the highest PAO2 one could expect to observe in an individual breathing room air at sea level?

a. 90 to 100 mm Hg
b. 110 to 120 mm Hg
c. 640 to 670 mm Hg
d. 710 to 760 mm Hg

Question 2

Which of the following conditions must exist for gas to move between the alveolus and pulmo-nary capillary?

a. Adequate alveolar ventilation (VA)
b. Difference in partial pressures (pressure gradient)
c. Normal central nervous system (CNS) control mechanism
d. Sufficient amount of blood hemoglobin (Hb)

s.meritte · **Reply #1 on:** Jul 16, 2018

Answer to Question 1

ANS: B
Neural control mechanisms and the increased of work breathing prevent decreases in PACO2 much below 15 to 20 mm Hg. Thus, whenever a patient is breathing room air at sea level, the res-piratory therapist should not expect to see a PaO2 any higher than 120 mm Hg during hyperven-tilation.

Answer to Question 2

ANS: B
Diffusion is the process whereby gas molecules move from an area of high partial pressure to an area of low partial pressure.