The best description for the sympathetic division of the autonomic nervous system is that it secretes norepinephrine.
What is an autonomic nervous system?
An autonomic nervous system (ANS) can be defined as a component of the peripheral nervous system (PNS) in vertebrates, that is mainly responsible for the control and regulation of involuntary physiologic processes such as the glands and muscles of internal organs.
In Medicine, norepinephrine is aslo known as noradrenaline and it refers to a chemical substance that is predominantly secreted (released) from the sympathetic division of the autonomic nervous system (ANS), so as to increase both the rate and force of contraction of the heart, as well as skeletal muscle.
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