Fig. 4. The baseline control (x) wall shear stress (dyn/cm2) values and wall shear stress after the 30-min test infusion (•) of nitroprusside (n = 8) or nitroglycerin (n = 8). Wall shear stress values are shown for ( A ) the feed and ( B ) branch arterioles at the first, third, and last branch points, as shown in figure 1 . *Differs from control.