0 affecting the width of the blood vessels in the body (= the tubes through which blood flows), and therefore affecting blood pressure: --
Secretion of vasoactive substances (e.g. renin) may cause arterial hypertension.
The vasoactive peptide AngiotensinII (AngII) is an important factor in the cardiovascular system.
In acute variceal bleeding, vasoactive drugs that lower portal pressure should be started even before endoscopy.
It is thought that vasoactive amines within the cheese trigger various neurotransmitters.