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* NO activates the enzyme guanylate cyclase.
 
* NO activates the enzyme guanylate cyclase.
 
* Guanylate cyclase converts guanylate triphosphate (GTP) into cyclic guanyosine monophosphate (cGMP).
 
* Guanylate cyclase converts guanylate triphosphate (GTP) into cyclic guanyosine monophosphate (cGMP).
* Causes smoot muscle of '''corporal sinusoids''' to relax (vasodilation).
+
* Causes smooth muscle of '''corporal sinusoids''' to relax (vasodilation).
 
* '''Cavernous sinusoids''' engorge with blood.
 
* '''Cavernous sinusoids''' engorge with blood.
 
* Intracorporal pressure increases dramatically.
 
* Intracorporal pressure increases dramatically.
 
* Pressure compresses the venules through which blood exits the penis.
 
* Pressure compresses the venules through which blood exits the penis.
 
* Blood trapped within the penis causing an erection.
 
* Blood trapped within the penis causing an erection.
 +
 
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== Sensory Input and Local Vascular Response ==
 
== Sensory Input and Local Vascular Response ==
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