Multiple Choice
Which part of the nephron performs the majority of water reabsorption?
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25. The Urinary System
The Nephron
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
What does the countercurrent mechanism accomplish in the nephron loop?
A
It filters blood plasma to form the initial filtrate.
B
It concentrates urine by creating a gradient that allows water reabsorption.
C
It increases blood pressure by constricting the afferent arterioles.
D
It secretes hormones that regulate electrolyte balance.
Verified step by step guidance1
Understand the function of the nephron loop, also known as the loop of Henle, which is a part of the kidney's nephron responsible for concentrating urine.
Learn about the countercurrent mechanism, which involves the flow of filtrate in opposite directions in the descending and ascending limbs of the nephron loop.
Recognize that the descending limb is permeable to water but not to solutes, allowing water to be reabsorbed into the surrounding interstitial fluid.
Identify that the ascending limb is impermeable to water but actively transports solutes like Na+ and Cl- into the interstitial fluid, creating a concentration gradient.
Understand that this gradient established by the countercurrent mechanism facilitates the reabsorption of water from the collecting ducts, thereby concentrating the urine.
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