blood pressure ( bp ) and plasma indices of three major pressure control systems -- plasma norepinephrine and epinephrine , plasma renin activity ( pra ) , and plasma arginine vasopressin -- were measured simultaneously in 12 normal and 15 mildly essential hypertensive subjects before and after removal of 480 ml of blood by phlebotomy , to determine if there were differences in the compensatory response to acute blood loss .
C0028351
norepinephrine
C0014563
epinephrine