arterioles and venules , which were preconstricted with norepinephrine , dilated to their initial baseline diameters after angiotensin ii ( 10 ( -6 ) m ) , a response not observed when the microvessels were pretreated with either an angiotensin antagonist or a prostaglandin synthesis inhibitor .
C0003009
angiotensin ii
C0003018
angiotensin