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Artery: Afferent arterioles
Gray1128.png
Scheme of renal tubule and its vascular supply. (Label "Afferent vessel" is visible in upper left.)
Gray1129.png
Distribution of bloodvessels in cortex of kidney.
Latin arteriola glomerularis afferens
Gray's subject #253 1221
Source interlobular artery   
Branches glomerular capillaries

The afferent arterioles are a group of blood vessels that supply the nephrons in many excretory systems. They play an important role in the regulation of blood pressure.

The afferent arterioles branch from the renal artery which supplies blood to the kidneys.

The afferent arterioles later diverge into the capillaries of the glomerulus.

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.

See also

Efferent arteriole

Additional images

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