well basically I am trying to gain a good understanding of the area using papers.Like i know its an endothelium derived vasodilator. Also that NO upregulates the conversion of GMP to cyclic GMP, and cGMP fuels Protein Kinase G, which phosphorylates...something I forget what, which decreases intracellular calcium. Calcium is what ultimately contracts your smooth muscle, so when intracellular calcium is decreased, you have smooth muscle relaxation.But I am trying to find out more about its purpose in the cardiovascular system while using papers to help explain it.Also if i can find graphs this would be a bonus as it may make some ponits more clear.Any help would be really appreciated.