Question

Humoral control of blood flow involves the effect of vasodilator and vasoconstrictor substances in the blood. Select the factor that has a powerful vasodilator effect on arterioles and increases capillary permeability.

Answer 1

Histamine.

Step-by-step explanation:

Histamine is the factor that increases the capillary permeability and has a vasodilator effect on arterioles. Histamine is generally in mast cells and in a type of white blood cells. It increases the permeability and vasodilates arterioles so that proteins and white blood cells that are in the blood can fight pathogens in a tissue.