Multiple Choice
Which of the following factors results in a decrease in glomerular capillary pressure?
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25. The Urinary System
Renal Physiology: Regulation of Glomerular Filtration
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What effect does constricting the efferent arteriole have on the glomerular filtration rate?
A
It causes the glomerular filtration rate to fluctuate.
B
It decreases the glomerular filtration rate.
C
It increases the glomerular filtration rate.
D
It has no effect on the glomerular filtration rate.
Verified step by step guidance1
Understand the role of the efferent arteriole in the nephron: The efferent arteriole carries blood away from the glomerulus after filtration has occurred.
Consider the effect of constriction on blood flow: Constricting the efferent arteriole increases resistance to blood flow, which can lead to changes in pressure within the glomerulus.
Apply the concept of hydrostatic pressure: Constriction of the efferent arteriole increases hydrostatic pressure in the glomerular capillaries, which is a key factor in determining the glomerular filtration rate (GFR).
Relate pressure changes to filtration rate: Increased hydrostatic pressure in the glomerulus enhances the filtration process, thereby increasing the glomerular filtration rate.
Conclude the effect: Constricting the efferent arteriole leads to an increase in the glomerular filtration rate due to elevated pressure within the glomerulus.
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