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'''''Local Vascular Component'''''
 
'''''Local Vascular Component'''''
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* When corporal smooth muscles relax because of cGMP, resistance to blood flow by penile arterioles and '''corporal sinusoids''' decreases.
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* Blood flow to the penis triples or quadruples.
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* When erection occurs, sinusoid pressure is so great that '''emissary veins''' are collapsed.
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** Venous outflow blocked
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* Penile erection maintained for as long as vasodilation of corporal smooth muscle takes place.
    
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