1, ?,and ?andand ?andand ?andand arteries in each condition. Inhibition of RyRs eliminates Ca2+ sparks and elevates global Ca2+ in smooth muscle cells of pressurized mesenteric arteries. and RyRs act in concert to oppose myogenic vasoconstriction, BK Tolfenamic acid channels oppose neurogenic vasoconstriction and RyRs augment it. A scheme...