what is mean by potent vasodilator
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Histamine is a chemical which is released during allergy or anaphylaxis by mast cells( a type of white blood cell) .Histamine is a potent vasodilator means that this chemical has a very powerful effect on vasodilation i.e wideninig of blood vessels(arterioles and capillaries).
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Vasodilator:-
something that promotes the dilatation of blood vessels
Examples of pulmonary vasodilators include:
Oxygen.
Nitric oxide.
Nitroprusside (Nipride, Nitropress)
Sildenafil (Revatio, Viagra)
Tadalafil (Adcirca, Cialis)
Bosentan (Tracleer)
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