When renal blood flow is reduced (indicating hypotension), the macula densa releases prostaglandins, which cause the juxtaglomerular cells lining the afferent arterioles to release renin, activating the renin-angiotensin-aldosterone system, to increase blood pressure.
- Essentials of Human Physiology by Thomas M. Nosek. Section 7/7ch03/7ch03p10. - "Renal Vasculature: Efferent Arterioles & Peritubular Capillaries"
- Template:UCDavisOrganology - "Mammal, renal vasculature (EM, Low)"
- Histology at University of Southern California ren/c_11