A patient with atherosclerotic heart disease experiences chest pain during exertion because the:
A. coronary arteries suddenly spasm and cause a marked reduction in myocardial blood flow.
B. lumen of the coronary artery is narrowed and cannot accommodate increased blood flow.
C. tissues of the myocardium undergo necrosis secondary to a prolonged absence of oxygen.
D. ragged edge of a tear in the coronary artery lumen causes local blood clotting and arterial narrowing.
Answer: B. lumen of the coronary artery is narrowed and cannot accommodate increased blood flow.
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