Question

Glomerular filtration rate would be decreased by

• A. an increase in renal blood flow
• B. compression of the renal capsule
• C. constriction of the efferent arteriole
• D. an increase in afferent arteriole pressure

Answer 1

Answer: (A)

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'.