Multiple Choice
Which of the following would decrease the glomerular filtration rate?
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25. The Urinary System
Renal Physiology: Regulation of Glomerular Filtration
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What occurs when plasma glucose concentration exceeds the renal plasma threshold?
A
Glucose is reabsorbed completely by the kidneys.
B
Glucose appears in the urine, a condition known as glucosuria.
C
The liver increases glycogen synthesis.
D
The pancreas stops producing insulin.
Verified step by step guidance1
Understand the concept of renal plasma threshold: This is the concentration level at which the kidneys can no longer reabsorb glucose efficiently, leading to its excretion in urine.
Recognize the role of the kidneys in glucose reabsorption: Normally, the kidneys filter blood and reabsorb glucose back into the bloodstream until the renal plasma threshold is reached.
Identify what happens when the threshold is exceeded: When plasma glucose concentration surpasses this threshold, the transport mechanisms in the kidneys become saturated, and glucose begins to appear in the urine, a condition known as glucosuria.
Consider the physiological implications: Glucosuria indicates that the body is unable to manage high blood glucose levels effectively, often seen in conditions like diabetes mellitus.
Differentiate between the options provided: The correct answer is that glucose appears in the urine, not complete reabsorption, increased glycogen synthesis, or cessation of insulin production.
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