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Transmission of Autonomic Stimuli. Like other nerves, those of the autonomic nervous system convey their messages to the appropriate end organs (blood vessels, viscera, etc.) by releasing transmitter substances to which the receptors of the target cells are responsive.
1 Autonomic nervous system-This set of nerves works automatically. 2  We don't have to think about them, the brain does it all for us. 3  It would take a lot of concentration if we had to constantly tell our heart to beat or our digestive system to release certain enzymes. 4  I'm sure I'd forget and would be dead in no time!