11. These arterioles are less than 100 �m in diameter. 12. Each fibre is accompanied by an arteriole and one or more nerve fibres. 13. The germinal centers are supplied by arterioles called " penicilliary radicles ". 14. As blood flows from the arterioles into the capillaries a change in pressure occurs. 15. The vascular pole is where the afferent and efferent arterioles communicate with the glomerulus. 16. A glomerulus receives its blood supply from an afferent arteriole of the renal circulation. 17. "' Arteriolar vasodilators "'are substances that preferentially dilate arterioles . 18. Peripheral resistance is determined by functional and anatomic changes in small arteries and arterioles . 19. This also results in an acute vasodilation of the arterioles supplying the active tissue. 20. Are these vessels always veins, are or they sometimes arteries or smaller arterioles ?
