1) Anatomical branch 2) Arteria 3) Arterial blood vessel 4) Arteriola 5) Artery 6) Capillary artery 7) Capillary connection 8) Very small blood vessel 1) Arteriola 
An arteriole l is a small diameter blood vessel in the microcirculation that extends and branches out from an artery and leads to capillaries. Arterioles have muscular walls (usually only one to two layers of smooth muscle) and are the primary site of vascular resistance. The greatest change in blood pressure and velocity of blood flow occurs at t...
• (n.) A small artery.
(from the article `acrocyanosis`) bluish discoloration of the hands caused by spasms in arterioles (small arteries) of the skin. Less commonly, the feet are affected. The fingers or ... a vessel in the human or animal body in which blood circulates. The vessels that carry blood away from the heart are called arteries, and their very .....
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 decre...
<anatomy> A minute artery, especially one that leads to a capillary. ... (17 Oct 1997) ... 
(ahr-tēr´e-ōl) a minute arterial branch. adj., arterio´lar., adj.
Small artery.Finest branch of an artery before capillary bed.
Ar·te'ri·ole noun [ New Latin arteriola , dim. of Latin arteria : confer French artériole .] A small artery. 
Type: Term Pronunciation: ar-tēr′ē-ōl Definitions: 1. A minute artery with a tunica media comprising only one or two layers of smooth muscle cells; a terminal artery continuous with the capillary network. Synonyms: arteriola
Arteriole: A small branch of an artery (a vessel that carries blood high in oxygen away from the heart to the body) leading to a capillary. The oxygenated hemoglobin (oxyhemoglobin) makes the blood in arteries and arterioles look bright red.
(ar-tir;eol) A minute arterial branch.
[n] - one of the small thin-walled arteries that end in capillaries
arteriola noun one of the small thin-walled arteries that end in capillaries
any of the smallest branches of an artery, terminating in capillaries.