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* Sinusoids are flattened because adrenergic nerves secrete noradrenaline (norepinephrine)that causes '''vasoconstriction'''.
 
* Sinusoids are flattened because adrenergic nerves secrete noradrenaline (norepinephrine)that causes '''vasoconstriction'''.
 
* Blood flow to cavernous tissue is low.
 
* Blood flow to cavernous tissue is low.
* No eretogenic stimuli present
+
* No erotogenic stimuli present
 
* Nonadrenergic noncholinergic (NANC) parasympathetic neurons do not fire.
 
* Nonadrenergic noncholinergic (NANC) parasympathetic neurons do not fire.
 
* No release of Nitric Oxide (NO)
 
* No release of Nitric Oxide (NO)
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'''''Erect Penis'''''
 
'''''Erect Penis'''''
   −
* Eretogenic stimuli present
+
* Erotogenic stimuli present
 
* NANC neurones fire and release NO from their terminals.
 
* NANC neurones fire and release NO from their terminals.
 
* NO activates the enzyme guanylate cyclase.
 
* NO activates the enzyme guanylate cyclase.
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