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

Multiple Choice

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.