Question

Why is the diameter of afferent arteriole smaller than the efferent arteriole?

Answer 1

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.

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Answer 2

The efferent arteriole carries blood away from the glomerulus. because it is has 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.

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