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One inhibitor of cGMP is Viagra. It provides a signal that leads to dilation of blood vessels and increase of? - viagra blood in stool

An inhibitor of cGMP is Viagra. It provides a signal that leads to the dilation of blood vessels and increasing blood into the penis, erections. CGMP inhibited, so that the signal is expanded. The original signal, which have impeded:

a) cGMP dephosphorylated.
b) GDP phosphorylated.
c) hydrolysis of GTP to GDP.
d) the elimination GMP Cell.
e) cGMP to GMP hydrolyzed.