Arteriole is the smallest subdivision of the arterial tree preceding the capillary; it has muscular walls which, by contracting and relaxing, can alter the flow of blood into body tissues.
afferent glomerular a. A branch of the interlobular artery of the kidney conveying blood to the glomerulus.
efferent glomerular a. Arteriole carrying blood from the glomerular capillary network
to the capillary bed of the proximal convoluted tubule.