Question
A normal cardiac function curve is illustrated in A. Identify the changes or events that would produce a displacement of the curve to 1 or 2 in B.
| A. |
1. Upward shifting of cardiac function curve is due to pathological conditions. 2. Downward shift of cardiac function curve is due to drug administration. |
| B. |
1. Upward shifting of cardiac function curve is due to parasympathetic stimulation . 2. Downward shift of cardiac function curve is due to pathological conditions / drug administration.
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| C. |
1. Upward shifting of cardiac function curve is due to sympathetic stimulation / drug administration. 2. Downward shift of cardiac function curve is due to pathological conditions |
| D. |
1. Upward shifting of cardiac function curve is due to heart failure. 2. Downward shift of cardiac function curve is due to myocardial infarction. |
Show Answer
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Correct Answer � C Explanation |
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Ans. C.
The graph depicts the Cardiac function curve.
- Cardiac function curve is shifted upward by sympathetic stimulation or administration of drugs that enhance myocardial contractility (inotropic agents).
- Cardiac function curve is depressed by myocardial ischemia, infarction, and heart failure.