Regarding Its Role as a Neurotransmitter in the CNS,norepinephrine

Multiple Choice

Regarding its role as a neurotransmitter in the CNS,norepinephrine

A) is secreted by brainstem neurons in response to sensory stimulation.
B) amplifies weak sensory signals and dampens strong ones so that more information can reach conscious levels.
C) is important for maintaining directed attention.
D) is completely absent from the CNS,it is only used in the PNS.
E) is only important for processing visual stimuli.