experiments were designed using conscious sprague-dawley rats to determine the blood pressure ( bp ) and heart rate ( hr ) responses to intravenous doses of ( 1 ) the adrenal catecholamines noradrenaline ( na ) and adrenaline ( a ) , ( 2 ) adrenal pentapeptides methionine enkephalin ( me ) and leucine enkephalin ( le ) , ( 3 ) combination ( i.v . ) injections of both me or le with na or a that modulate the hemodynamic responses when the adrenal catecholamines were given alone , and ( 4 ) the possible receptor mechanisms mediating the resultant bp and hr response to i.v . pentapeptide administration .
C0014563
adrenaline
C0028351
na