The myocardium receives blood via coronary arteries that attach ...

[colton]

The myocardium receives blood via coronary arteries that attach to
 
  1. the aortic arch.
  2. the superior vena cava.
  3. the pulmonary vein.
  4. the base of the aorta.

Question 2

Which of the following would be the most likely reason that atherosclerotic plaque would be responsible for producing a myocardial infarction?
 
  1. Atherosclerotic plaque builds up on the endocardium, preventing blood from leaving the atriums.
  2. Atherosclerotic plaque results in a narrowing of 50 of the coronary arteries.
  3. Atherosclerotic plaque impairs the ability of coronary arteries to constrict and dilate.
  4. Atherosclerotic plaque causes a blockage that prevents blood from reaching the myocardium.

[leeeep]

Answer to Question 1

Correct Answer: 4
Rationale: The coronary arteries arise from the base of the heart.

Answer to Question 2

Correct Answer: 4
Rationale: Atherosclerotic plaque builds up inside of blood vessels that supply heart tissue oxygen-rich blood. When the blood flow is blocked, the myocardium is damaged. Atherosclerotic plaque does damage the elasticity of blood vessels, but this is less likely to produce a myocardial infarction. Atherosclerotic plaque can result in a myocardial infarction when blocked by 50, but more likely it will not. Atherosclerotic plaque builds up in blood vessels, not in heart chambers. (p. 339)

[colton]

Great answer, keep it coming

[okolip]

Gracias!