One group of neurotransmitters retards heart rate,promotes digestion,contracts the eye pupil,etc.The other group has the opposite effect.These drugs are affecting the
A)motor and sensory nerves.
B)cerebrum and cerebellum,respectively.
C)central and peripheral nervous systems.
D)neurostimulatory and neuroinhibitory synapses.
E)sympathetic and parasympathetic nervous systems.

Question

Quizplus · Accepted Answer

The two groups of neurotransmitters described in the question refer to the sympathetic and parasympathetic nervous systems. The sympathetic nervous system produces the fight-or-flight response, which involves an increase in heart rate, dilation of the pupil, and inhibition of digestion. The parasympathetic nervous system, on the other hand, produces the rest-and-digest response, which involves a decrease in heart rate, constriction of the pupil, and stimulation of digestion. Drugs that affect these neurotransmitters are typically either sympathomimetics (which mimic the effects of the sympathetic nervous system) or parasympathomimetics (which mimic the effects of the parasympathetic nervous system).

One Group of Neurotransmitters Retards Heart Rate,promotes Digestion,contracts the Eye