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Sympathetic postganglionic axons diverge more extensively resulting in simultaneous activation of many tissues.
Acetycholinesterase quickly inactivates acetylcholine while norepinephrine remains in the synaptic cleft longer.
Epinephrine and norepinephrine are secreted into the blood by the adrenal medulla intensifying the effects of norepinephrine released from sympathetic postganglionic axons.
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The sympathetic division, is the emergency system. It prepares the body to put out energy and to protect it from effects of injury. It shuts the gut down, speeds up the heart, increases blood pressure, dilates (makes bigger) the pupils of the eyes, makes more glucose (blood sugar) available in the blood for energy, etc. Preparation for fight or flight (running away).
The parasympathetic division, is the "housekeeping" division. It acts to replace and recover from the activities of living. Its action is (almost always) the opposite of the sympathetic division. It activates the gut for digestion, slows the heart rate, decreases the blood pressure, etc
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