An otherwise healthy medical student visits pikes peak (barometric pressure of 450 mmHg) during spring break. druing her first hour on the peak, she was foced to rest at periodic intervals. Which of the following is increased?
A. The alveolar-arterial oxygen gradient
B. The concentration of oxygen in the arterial blood
C. the Alveolar PO2
D. Hemoglobin saturation with oxygen
E. Minute Ventilation