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Figure 1 Typical volume/pressure relation. A = unstressed volume; (B-A)/A x 100 = % venodilation with carbachol; (C-A)/A x 100 = % vasoconstriction with L-NMMA; (B-D)/(B-A) x 100 = % nitric oxide component of carbachol response. L-NMMA = N-monomethyl-L-arginine.