Author Question: The myocardium receives blood via coronary arteries that attach to 1. the aortic arch. 2. the ... (Read 33 times)

colton · **on:** Jul 23, 2018

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 · **Reply #1 on:** Jul 23, 2018

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)