Fig. 8.

Maximal responses to agonists in FA and arterioles supplying the GM of Young and Old. Maximal vasoconstrictions to PE (from Fig. 3) and to UK 14304 (from Fig. 4) were attenuated throughout the resistance network of GM in Old versus Young; this effect increased with arteriolar branch order. Maximal dilation to ACh (from Fig. 6) was depressed in FA of Old versus Young; in arterioles, maximal vasodilation increased with branch order with Old progressively greater than Young. Summary data are means ± SE; n = 5 per group. ΔP < 0.05, main effect of branch order; *P < 0.05, Old vs. Young.