In a normal person at rest, breathing 21% 02 at sea level, results in: a. 21% of 02 is carried by the blood O b. The fraction of soluble 02 in the plasma is 21% relative to the amount of 02 carried by Hb. O C. His mixed expired air contains no CO2. O d. Stimulation of respiratory center because of low Pa02. O e. Alveolar PO2 in this person can reach 100 mm Hg.

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