Q.

Which of the following increases the rate of heart beat?

A. Peripheral nerves
B. Sympathetic nerves
C. Parasympathetic nerves
D. Cranial nerves
Answer» B. Sympathetic nerves
Explanation: Heart rate is controlled by the two branches of the autonomic (involuntary) nervous system. The sympathetic nervous system (SNS) and the parasympathetic nervous system (PNS). The sympathetic nervous system (SNS) releases the hormones (catecholamines - epinephrine and norepinephrine) to accelerate the heart rate. The parasympathetic nervous sys-tem (PNS) releases the hormone acetylcholine to slow the heart rate.
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