Afferent Circulation
The afferent arteriole that supplies the capillaries of a glomerulus branches off of an interlobular artery in the renal cortex. Glomerular capillary pressure, and thus glomerular filtration rate, can be influenced by constriction or relaxation of the afferent arteriole, resulting in decreases or increases in pressure. As an example, one study involving rats found that having narrowed afferent arterioles contributed to the development of increased blood pressure. Sympathetic nervous system action as well as hormones can also impact glomerular filtration rate by modulating afferent arteriole diameter.
Read more about this topic: Glomerulus
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