Calcium channel blockers work by reducing calcium influx into the cells of the heart and blood vessels. Calcium channels are coupled to which type of autonomic nervous system receptors?
A. Alpha1
B. Alpha2
C. Beta1
D. Beta2
Answer: C. Beta1
Explanation: Calcium channels are coupled to beta1-adrenergic receptors in the heart. For that reason, calcium channel blockers affect the heart in ways similar to the beta blockers. Both types of drugs cause a decrease in the force of contraction, heart rate, and cardiac impulse conduction.
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