What is derived from the following equation?
X = [PB -PH₂₀] F_IO₂ - PaCO₂ (1.25)

Question

What is derived from the following equation? X = [PB -PH₂₀] F_IO₂ - PaCO₂ (1.25) A) P_AO₂ B) P_ACO₂ C) P_N₂

Quizplus · Accepted Answer

The equation given is the alveolar gas equation, used to calculate the partial pressure of oxygen in the alveoli. The variables in the equation are as follows:
X = partial pressure of oxygen in the alveoli
PB = barometric pressure
PH₂₀ = partial pressure of water vapor at body temperature (37°C)
FS = fraction of inspired oxygen (usually 0.21)
U1B1I = respiratory exchange ratio (usually 0.8)
S1U1B0O₂ = saturation of hemoglobin with oxygen in arterial blood (usually 1.0)
PaCO₂ = partial pressure of carbon dioxide in arterial blood

So, the answer is A which represents the partial pressure of oxygen in the alveoli under normal physiological conditions.

What Is Derived from the Following Equation