H2k20
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So the blood enters the afferent arteriole at a high pressure.
into the glomerulus
and leaves by the efferent arteriole, which has a smaller lumen than afferent arterioles.

So how does have a smaller lumen aid ultrafiltration?
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Davies Chemistry
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By making the lumen of the efferent arteriole smaller, you make it harder for blood to leave via this, so some of the fluid is forced through the filter of the Bowman's capsule.
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