Vasodilation

Vasodilation (from Latin vas vessel ' and dilatation of, extension' ) denotes the dilation of blood vessels.

Vasodilation can be both active, and passive, for example, caused by increased blood volume, for example, in relaxation of vascular smooth muscle, as. The interaction of nerves and muscles in active vasodilatation is called vasomotion.

Vasodilation also opens angiogenesis and is primarily in response to changes in the concentration of nitric oxide.

The opposite of vasodilation, the vasoconstriction.

Vasodilation and vasoconstriction of the cerebral vessels are considered the main causes of migraine headache.

Most relaxation techniques ( such as autogenic training, etc.) are actively trying to cause vasodilation. It is mainly responsible for the relaxation effects.

An allergic reaction can cause vasodilatation but also by the release of histamine, which dilates the blood vessels occur, and redness of the skin, or even anaphylactic shock.