Which action will occur when a patient's á1-receptors are stimulated?
a. Dilation of the coronary arteries
b. Vasoconstriction of arteries
c. Increase in the strength of myocardial contraction
d. Decrease in the rate of myocardial con-traction
ANS: C
Stimulation of á1-receptors results in increased strength and rate of myocardial contraction. á1-receptor stimulation does not affect the coronary arteries. á1-receptor simulation leads to dila-tion.
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