If the diameter of the afferent renal arteriole is decreased and that of the efferent renal arteriole is increased, the ultrafiltration will

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takes place with the same speed

be slower

be faster

not takes place

answer is B.

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Detailed Solution

During ultrafiltration in the nephrons, the diameter of the afferent (incoming) arteriole will be greater than that of the efferent (outgoing) arteriole. This increases the glomerulus blood pressure and helps to force the components of the blood get out of the glomerular capillaries.

If the diameter of the afferent renal arteriole is decreased and that of efferent renal arteriole is increased, the process of ultrafiltration gets hampered and will be slower. The actual pressure gradient will not be observed, and the filtration of all the components will not be possible.

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