“Higher concentrations of magnesium in the perfusate attenuated the vascular responses to norepinephrine and potassium chloride in a dose-related manner.”
“The attenuating effect of magnesium on the responses to norepinephrine and to potassium chloride were reversed by elevation of calcium concentration in the perfusate.”
“These results indicate that magnesium acts antagonistically on calcium movement in vascular contractions due to potassium chloride , but that the relationship between magnesium and calcium is more complex in vascular contractions induced by norepinephrine.”