A 23-Year-Old Man Undergoes Exercise Physiology Testing at Sea Level

A 23-year-old man undergoes exercise physiology testing at sea level.  He jogs on a treadmill to achieve a moderate-intensity physical activity level based on a target heart rate of 50%-70% of his estimated maximum heart rate.  An increase in which of the following is expected at the peak of his exertion?

A) Arterial blood mean CO₂ content
B) Arterial blood mean O₂ content
C) Hemoglobin affinity for O₂
D) pH of the arterial blood
E) Physiologic dead space
F) Venous blood mean CO₂ content
G) Venous blood mean O₂ content

Correct Answer:

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