The parasympathetic nervous system causes a slowing of the heart rate by increasing:
A) Norepinephrine
B) Vessel constriction
C) Cardioinhibitory center
D) Smooth muscle tone
Ans: C
Feedback:
The medullary cardiovascular neurons are grouped into three distinct pools that lead to sympathetic innervation of the heart and blood vessels and parasympathetic innervation of the heart. The cardioinhibitory center controls parasympathetic-mediated slowing of heart rate. The parasympathetic system has little or no control over blood vessels (constriction, tone). Norepinephrine is the main neurotransmitter for sympathetic neurons.
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