The Word of the Day comes from "THE BEAUTIFUL FALL" by Hugh Breakey. It his debut novel and I am buddy reading it with the wonderful Nat K.
noun plural noun: arterioles
a small branch of an artery leading into capillaries.
Arterioles are considered as the primary resistance vessels as they distribute blood flow into capillary beds. Arterioles provide approximately 80% of the total resistance to blood flow through the body.