Regulation of Glomerular Filtration Rate
When angiotensin II levels are increased due to activation of the renin-angiotensin-aldosterone system, most of the arteries in the body experience vasoconstriction, in order to maintain adequate blood pressure. However, this reduces blood flow to the kidneys. To compensate, the efferent arterioles constrict to a greater degree than the other arteries, in response to increased levels of angiotensin II. Pressure in glomerular capillaries is therefore maintained and glomerular filtration rate remains adequate.
Read more about this topic: Efferent Arteriole
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