Why may a "racing heart" (170 bpm) cause chest pain?
A) Chemicals produced by the metabolizing cells stimulate the vagal pain receptors.
B) A racing heart decreases diastole,the period when coronary blood flow is maximal.
C) A racing heart decreases the time that the heart spends in systole.
D) Excess waste produced by metabolizing myocardial cells causes microthrombi to accumulate in the coronary arteries.
Correct Answer:
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