Multiple Choice
What causes the release of renin from the juxtaglomerular apparatus?
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25. The Urinary System
Renal Physiology: Regulation of Glomerular Filtration
Multiple Choice
Approximately what percentage of the filtrate produced by the glomeruli is reabsorbed into the bloodstream under normal physiological conditions?
A
About 25%
B
About 99%
C
About 50%
D
About 10%
Verified step by step guidance1
Understand the role of the glomeruli in the kidneys: The glomeruli are responsible for filtering blood to produce filtrate, which contains water, ions, and waste products. This filtrate is the starting point for urine formation.
Recognize the concept of reabsorption: After the filtrate is produced, the majority of its components, such as water, glucose, and ions, are reabsorbed into the bloodstream through the renal tubules to maintain homeostasis.
Learn the normal physiological percentage of reabsorption: Under normal conditions, approximately 99% of the filtrate is reabsorbed into the bloodstream, leaving only about 1% to be excreted as urine.
Compare the given options: Evaluate the percentages provided in the question (25%, 99%, 50%, and 10%) and identify the one that matches the physiological norm for reabsorption.
Conclude that the correct answer is about 99%, as this reflects the normal reabsorption rate under healthy physiological conditions.
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