Worlds of David Darling
Encyclopedia of Science
   
Home > Encyclopedia of Science

arteriole




A blood vessel that branches off an artery. Arterioles themselves branch to form capillaries. Arterioles are intermediate in size between arteries and capillaries. They have a high proportion of smooth muscle in their walls, and their nerve supply enables them to be narrowed or widened to meet decreases or increases in the blood-flow needs of the tissues they supply.


Related category

   • ANATOMY AND PHYSIOLOGY