The answer is sympathetic. It is one of two components of the
autonomic nervous system; the other being parasympathetic. The other function of
the sympathetic system is to maintain body homeostasis. Acetylcholine
is the main neurotransmitter in the preganglionic
sympathetic neurons while noradrenaline (norepinephrine) is the main neurotransmitter
in the postganglionic sympathetic neurons.
