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Standard X
Biology
Question

Glomerular filtration rate would be decreased by?
  1. Construction of the efferent arteriole
  2. An increase in afferent arteriolar pressure
  3. Compression of the renal capsule
  4. An increase in renal blood flow

A
An increase in afferent arteriolar pressure
B
An increase in renal blood flow
C
Construction of the efferent arteriole
D
Compression of the renal capsule
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Solution
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Constriction of the afferent arteriole would increase the pressure in the afferent arteriole. This would decrease the blood flow into the glomerulus and hence, the glomerular filtration rate decreases. This is due to the decrease in the glomerular hydrostatic pressure.
So, the correct answer is 'An increase in afferent arteriolar pressure'.

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Q4

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