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Functions of the Autonomic Nervous System


There are two divisions of the autonomic nervous system; sympathetic and parasympathetic. These two motor divisions function to control autonomic functions. Neither division is "off" while the other is functioning.

However, many connections of the Sympathetic Division initiate functions that are opposite of those caused by innervation of the Parasympathetic Division. Therefore, the two divisions have neural connections to the same body location that function antagonistically as opposed to complementary.

The Autonomic Motor Divisions function antagonistically in three of the four functions described.

Which function described would NOT be antagonistic for its sympathetic and parasympathetic innervation?


The diameter of the blood vessels in skeletal muscles.


The diameter of bronchioles in the lungs.


The process of gastrointestinal peristalsis.


The heart rate.