What are vasodilation? Vasoconstriction?

Vasodilation:

Vasodilation may be defined as the dilation of the blood capillaries around the skin. The blood capillaries gets widen. The vascular resistance to the blood flow decrease. The blood pressure near the skin decreases. The increase in temperature may cause vasodilation.

Vasoconstriction:

Vasoconstriction may be defined as the constriction of the blood capillaries around the skin. The blood capillaries gets narrow. The vascular resistance to the blood flow increases. The blood pressure near the skin increases. The decrease in temperature may cause vasoconstriction.