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Home Q & A Board Biology-Related Homework Help Medicine Nursing and Clinical
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Leahc615 Leahc615
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6 years ago
A 51-year-old male presents with recurrent chest pain on exertion and is diagnosed with angina pectoris. The pain occurs when:
 
  a. cardiac output has fallen below normal levels.
  b. the myocardial oxygen supply has fallen below demand.
  c. myocardial stretch has exceeded the upper limits.
  d. the vagus nerve is stimulated.
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#1
6 years ago
ANS: B
Angina is chest pain caused by myocardial ischemia, which develops if the flow or oxygen con-tent of coronary blood is insufficient to meet the metabolic demands of myocardial cells. A de-crease in cardiac output would lead to general systemic symptoms, not just chest pain, which is due to a decrease in myocardial oxygenation. Myocardial stretch does not affect angina symp-toms. When the vagus nerve is stimulated, a change in rate occurs; it does not precipitate chest pain.
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