sympathetic nervous system
nouns
originates in the thoracic regions of the spinal cord; opposes physiological effects of the parasympathetic: reduces digestive secretions; speeds the heart; contracts blood vessels
is a part of
the part of the nervous system of vertebrates that controls involuntary actions of the smooth muscles and heart and glands
is a type of (narrower)
the sensory and control apparatus consisting of a network of nerve cells
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