Release of which humoral factors will result in vasodilation? Angiotensin II Serotonin Histamine Norepinephrine

Histamine release results in vasodilation.

Explanation:  

Angiotensin II: Angiotensin II is a peripheric vasoconstrictor peptide, that can increase blood pressure while circulating in the plasma. It also stimulates the secretion of aldosterone.Norepinephrine: Vasoconstrictor of resistance and capacitance vessels. Increase the heart biting frequency, and blood pressure, stimulating respiration and dilating the respiratory tracts.Serotonin: Vasoconstrictor biogenic amine. Very important neurotransmitter and neuromodulator of mood regulation, physiological functions, and behavior.Histamine: Vasodilator amine. This neurotransmitter accomplishes many functions in different cells and organs. These functions can be done when the molecule joins one of its receptors, H1, H2, H3. Among other functions, histamine can dilate little vessels, reducing the peripheric resistance and arterial pressure.  There are certain areas where this neurotransmitter acts as a vasodilator: brain vessels, skeletal muscle vessels, coronary., mesenteric and renal vessels. Although it is a vasodilator, it can also cause vasoconstriction in the liver and the spleen.

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