The annual percentage rate is the total yearly cost of a mortgage and is expressed as a percentage of the loan amount. The APR takes into consideration the total costs of home ownership when obtaining a mortgage. The total costs include certain fees such as interest, lender charges, mortgage insurance and points.
An arteriole /ÉrËtÉªÉri.oÊl/ 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 the transition of arterioles to capillaries.rain arterioles are particularly sensitive to pH with reduced pH promoting vasodilation. A number of hormones influence arteriole tone such as angiotensin II (vasoconstrictive), endothelin (vasoconstrictive), bradykinin (vasodilation), atrial natruretic peptide (vasodilation), and prostacyclin (vasodilation).
Arterioles connect with even smaller blood vessels called capillaries. Through the thin walls of the capillaries, oxygen and nutrients pass from blood into tissues, and waste products pass from tissues into blood. From the capillaries, blood passes into venules, then into veins to return to the heart. Arteries and arterioles have relatively thick muscular walls because blood pressure in them is high and because they must adjust their diameter to maintain blood pressure and to control blood flow.