A 65-year-old man is brought to the emergency department with chest pain that he noticed after climbing a set of stairs. The emergency physician sends him for an exercise stress test. Which of the following physiologic mechanisms does the heart use to deal with increased work demand during an exercise stress test?
A) Decreased coronary artery diameter
B) Decreased metabolite production
C) Decreased oxygen extraction
D) Increased coronary blood flow
E) Increased oxygen extraction
First Aid Q&A for Step1 [2nd edition]©
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