The nurse has reviewed information about the cardiovascular system before caring for a patient with heart disease. The nurse knows that which of the following statements is true concerning the physiology of the cardiovascular system?
a. Stimulating the parasympathetic system would cause the heart rate to increase.
b. When a person has heart muscle disease, the heart muscles stretch as far as is necessary to maintain function.
c. The QRS interval on the electrocardiogram represents the electrical impulses passing through the ventricles.
d. When stroke volume decreases, a resultant decrease in heart rate occurs.
C
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A Stimulating the parasympathetic system would cause the heart rate to decrease, not increase.
B In the diseased heart, the stretch of the myocardium is beyond the heart's physiological limits.
C The QRS complex indicates that the electrical impulse has travelled through the ventricles.
D When stroke volume is decreased, an increase in heart rate occurs.
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