The respiratory quotient (R) is a term that is also found in an equation called

Question

The respiratory quotient (R) is a term that is also found in an equation called the Alveolar Gas Equation, which calculates the pressure of oxygen in the alveolus (PAO2) taking into account the equilibrium between the amount of inspired oxygen and amount of oxygen entering the surrounding capillaries; if an individual is breathing room air, the equation can be approximated as:

PAO2 = 150 – PCO2/R

During intense exercise, assuming arterial pressure of CO2 is unchanged, what would you expect to happen to the PAO2 (relative to a resting state)?

A. PAO2 increases during exercise.

B. PAO2 decreases during exercise. incorrect

C. PAO2 stays the same during exercise.

Explanation / Answer

PaO2 increases during exercise.

During exercise, the inhaled oxygen volume becomes more to supplement the oxygen for muscles that are working more. Due to increased inhalation, volume of O2 in alveoli is more and hence, its partial pressure increases.

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