Vasomotion
Vasomotion (pronounced: vaso-mo-tion) is a term used in physiology to describe the spontaneous contraction and relaxation, or pulsation, of the blood vessels' muscular walls.
Etymology
The term "vasomotion" is derived from the Latin vas meaning "vessel", and the Greek motion meaning "movement".
Definition
Vasomotion is a process that causes the blood vessels to constrict (narrow) and dilate (widen) in a rhythmic or pulsating manner. This process is primarily observed in the arterioles, the small branches of arteries that lead to capillaries.
Function
The primary function of vasomotion is to regulate the flow of blood to different parts of the body. It helps to maintain blood pressure and ensures that tissues and organs receive the necessary amount of blood based on their current needs.
Mechanism
Vasomotion is controlled by the sympathetic nervous system. The frequency and amplitude of vasomotion can be influenced by various factors, including hormones, neurotransmitters, and local metabolic conditions.
Related Terms
- Vasoconstriction: The narrowing of blood vessels resulting from contraction of the muscular wall of the vessels.
- Vasodilation: The widening of blood vessels resulting from relaxation of the muscular wall of the vessels.
- Arterioles: Small branches of arteries leading to capillaries.
- Sympathetic nervous system: Part of the nervous system that serves to speed up the heart rate, constrict blood vessels, and raise blood pressure.
See Also
External links
- Medical encyclopedia article on Vasomotion
- Wikipedia's article - Vasomotion
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