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Author Question: What is the cause of a myocardial infarction? a. Decreased perfusion to the pulmonary ar-tery b. ... (Read 59 times)

vinney12

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on: Jul 16, 2018
What is the cause of a myocardial infarction?
 
  a. Decreased perfusion to the pulmonary ar-tery
  b. Partial or complete obstruction of a coro-nary artery
  c. Blockage in one or more of the great ves-sels
  d. Narrowing of part of the aorta

Question 2

The dicrotic notch recorded in the aorta immediately follows what mechanical event of the car-diac cycle?
 
  a. Closure of the aortic valve
  b. Closure of the atrioventricular valves
  c. Isovolume contraction
  d. Opening of the aortic valve


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katara

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Reply #1 on: Jul 16, 2018
Answer to Question 1

ANS: B
Partial obstruction of a coronary artery may lead to tissue ischemia (decreased O2 supply), a clin-ical condition called angina pectoris. Complete obstruction may cause tissue death or infarct, a condition called myocardial infarction (MI).

Answer to Question 2

ANS: A
Rather than immediately dropping off, aortic and pulmonary pressures rise again after the semi-lunar valves close. Note the feature termed the dicrotic notch, which is caused by the elastic re-coil of the arteries. This recoil provides the extra push that helps maintain the head of pressure created by the ventricles.


vinney12

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Reply 2 on: Jul 16, 2018
Great answer, keep it coming :)

Animal_Goddess

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Reply 3 on: Yesterday
Excellent

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