Multiple Choice
The filtration pressure in the glomerulus is determined by the balance of which two pressures?
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25. The Urinary System
Renal Physiology: Regulation of Glomerular Filtration
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Which of the following would reduce the glomerular filtration rate?
A
Constriction of the efferent arteriole
B
Increased blood pressure
C
Dilation of the afferent arteriole
D
Constriction of the afferent arteriole
Verified step by step guidance1
Understand the role of the glomerular filtration rate (GFR) in the kidneys, which is the rate at which blood is filtered in the glomeruli of the kidney.
Recognize that the afferent arteriole brings blood to the glomerulus, while the efferent arteriole carries blood away.
Consider how changes in the diameter of these arterioles affect blood flow and pressure in the glomerulus.
Constriction of the afferent arteriole reduces blood flow into the glomerulus, decreasing the pressure and thus reducing the GFR.
Contrast this with the effects of constriction of the efferent arteriole, increased blood pressure, and dilation of the afferent arteriole, all of which would increase or maintain GFR rather than reduce it.
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