One inhibitor of cGMP is Viagra. It provides a signal that lead to dilation of blood vessel and increase of?

One inhibitor of cGMP is Viagra. It provides a signal that leads to dilation of blood vessels and increase of blood in the penis, facilitate erection. cGMP is inhibited, therefore the signal is prolonged. The original signal that is presently inhibited would have:

a) dephosphorylated cGMP.
b) phosphorylated GDP.
c) hydrolyzed GTP to GDP.
d) removed GMP from the cell.
e) hydrolyzed cGMP to GMP.
Answers:
E

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