FACTOID # 17: Though Rhode Island is the smallest state in total area, it has the longest official name: The State of Rhode Island and Providence Plantations.
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Encyclopedia > Blood vessels
The system of arteries

The blood vessels are part of the circulatory system and function to transport blood throughout the body.



  • Vasoconstriction is the constriction of blood vessels (narrowing, becoming smaller in cross-sectional area) by contracting the vascular smooth muscle in the vessel walls.

Vasoconstrictors are used to increase blood pressure or to reduce local blood flow.

  • Vasodilation is the dilation of blood vessels (widening) by relaxing the smooth muscle in the vessel walls.

Vasodilation and vasoconstriction are used antagonistically as a method of thermoregulation in homeotherms.

See also

Cardiovascular system

Heart - Aorta - Arteries _ Arterioles - Capillaries _ Venules - Veins - Venae cavae - Pulmonary arteries _ Lungs - Pulmonary veins - Blood

  Results from FactBites:
Blood Vessel Disorders - Overview, FAQs - dermatologychannel (771 words)
The blood supply in the skin (cutaneous blood supply) is delivered by an interconnecting network of small arteries (arterioles), veins (venules), and tiny vessels called capillaries that connect the arterioles to the venules.
In the embryo, certain cells are responsible for stimulating blood vessel development.
These are tiny dilated blood vessels found in the skin's surface layer.
Blood vessel Summary (1458 words)
The term "arterial blood" is nevertheless used to indicate blood high in oxygen, although the pulmonary artery carries "venous blood" and blood flowing in the pulmonary vein is rich in oxygen.
Blood vessels do not actively engage in the transport of the blood (they have no appreciable peristalsis), but arteries - and veins to a degree - can regulate their caliber by contraction of the muscular layer.
Atherosclerosis, the formation of lipid lumps (atheromas) in the blood vessel wall, is the prime cause of cardiovascular disease, the main cause of death in the Western world.
  More results at FactBites »



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