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Question

If the afferent arteriole diameter is less than efferent arteriole, then which of the following condition is possible?

A
No effect
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B
Ultrafiltration reaction is slow
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C
Ultrafiltration is not possible
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D
Ultrafiltration will stop and tubular secretion will start
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Solution

The correct option is A Ultrafiltration is not possible
Blood is delivered to the kidney by the renal artery. The renal artery enters as an afferent arteriole and forms a tuft of capillaries in the Bowmans capsule and comes out as efferent arteriole. Afferent arteriole is wider in diameter than the efferent arteriole which builds the pressure inside the glomerulus and leads to filtration. If the afferent arteriole diameter is less than efferent arteriole then ultrafiltration is not possible
So, the correct answer is option A.

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