Moreover, I remember one really really old anatomy professor teaching us a mnemonic for remembering whether the sympathetic or parasympathetic system controlled tumenescence ( getting erect ) or detumenescence : "'P "'oint and "'S "'hoot.
12.
Postganglionic sympathetic systems are usually regulated by norepinephrine ( noradrenaline ) ( adrenergic receptors ), whereas parasympathetic systems are acetylcholine-based, and instead rely on muscarinic receptors ( some post-ganglionic sympathetic neurons, such as those stimulating sweat glands, release acetylcholine ).
13.
In humans, triggers clearly distinct from those known to initiate a Bezold Jarisch reflex can also elicit VVS . Whatever the actual trigger, vagal afferents carry signals to higher CNS centers, which act through autonomic nuclei in the medulla to cause a massive stimulation of the parasympathetic system and abolition of sympathetic tone.
14.
:your nervous syztem winds down the sympathetic system and fires up the parasympathetic system at night, as you go into rest mode and out of active mode . as a result, your attention is shifted to your internal stimuli, rather than external stimuli in the world . sick people tend to feel more miserable at night . talk ) 16 : 55, 3 November 2008 ( UTC)
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