Vasodilation

increase in the diameter of a blood vessel.

Vasoconstriction

decrease in the diameter of a blood vessel

vasometer regulates:

vasoconstriction and vasodilation.

Angi+omas

tumors consisting principally of blood vessels (hemangioma) or lymph vessels (lymphangioma)

Aorto+graphy

radiography of the aorta after the injection of a contrast medium to enhance the visibility of the aorta on an x-ray image

aortogram

record produced from aortography

Aortic stenosis

narrowing of the aortic valvo

Arterio+graphy

radiography of arteries after injection of radiopaque material into the bloodstream

Angio+cardio+graphy

radiography of the heart and great vessels after intravenous injection of a radiopaque solution