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“In calcium-free solution, prostaglandin F2 alpha-induced contractions increased with increasing potassium concentrations, but no enhancement occurred when lithium was substituted for potassium.”
“ Prostaglandin F2 alpha , but not norepinephrine, augments the maximal contractile response to potassium.”
“These results suggest that potassium enhances coronary vascular smooth muscle contraction to prostaglandin F2 alpha , but not norepinephrine, independently of calcium entry.”