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The sympathetic nervous system is one of the divisions of the autonomic nervous system. It involuntarily regulates the contraction of smooth muscles and the secretion of many glands. Its effects are opposite to those of the parasympathetic nervous system. The most important neurotransmitters are adrenaline and norepinephrine. Its main action is related to a fight response to external stimuli that can endanger the body, so it increases the frequency and strength of the heartbeat, dilates the lungs, dilates the pupil, increases blood pressure, It dilates the blood vessels and stimulates the production of sweat by the sweat glands. A schema is attached to the Word file.
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