Physiology Answers
1. E
2. B
3. D
4. C
5. A
6. B
7. D
8. C
9. D
10. B
11. D
12. A
13. C
14. E
15. A
Heart
1. Myocardial infarction
a. Is characterized by necrosis beginning approximately 30 minutes
after coronary occlusion
b. Most often involves occlusion of the left circumflex coronary artery
c. Are apparent macroscopically at around one hour after coronary
occlusion
d. Typically results in liquefactive necrosis
e. Is subendocardial if only two thirds of the ventricular wall is involved
2. regarding the changes to myocardium after MI
a. pallor at 24 hours
b. wavy fibres are found centrally
c. decreased contractility after 5 minutes
d. liquefactive necrosis is typical
e. sarcoplasm is resorbed by leukocytes
3. In compensated cardiac hypertrophy changes include:
a. Diffuse fibrosis
b. Hyperplasia
c. Decreased sarcomeres
d. Increased capillary density
e. Increased capillary/myocyte ratio