Multiple Choice
Which of the following is the countercurrent multiplier in the kidney?
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25. The Urinary System
The Nephron
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Which region of the nephron is permeable to water but not to NaCl?
A
Proximal convoluted tubule
B
Distal convoluted tubule
C
Ascending limb of the loop of Henle
D
Descending limb of the loop of Henle
Verified step by step guidance1
Understand the structure of the nephron, which is the functional unit of the kidney, consisting of different segments including the proximal convoluted tubule, loop of Henle, distal convoluted tubule, and collecting duct.
Recognize that the loop of Henle has two main parts: the descending limb and the ascending limb, each with distinct permeability characteristics.
Recall that the descending limb of the loop of Henle is permeable to water but not to solutes like NaCl. This allows water to be reabsorbed into the bloodstream, concentrating the filtrate.
Contrast this with the ascending limb of the loop of Henle, which is impermeable to water but actively transports NaCl out of the filtrate, further diluting it.
Conclude that the region of the nephron that is permeable to water but not to NaCl is the descending limb of the loop of Henle, as it allows water reabsorption while retaining NaCl in the filtrate.
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