why are afferent arterioles wider than efferent arterioles
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Ultrafiltration means "filtration with pressure", the pressure is to force fluid out of the blood into the nephron. Afferent is wider so that pressure is maintained in the glomerulus.
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The efferent arteriole carries blood away from the glomerulus. Because it has a smaller diameter than the afferent arteriole, it creates some resistance to blood flow, producing the back-up of blood in the glomerulus which creates higher pressure in the glomerular cavity.
Explanation:
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