GENERAL ANATOMY
URINARY SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The loop of Henle can concentrate urine because of which one?
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The change from water permeability to impermeability along the loop allows this.
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It can actively pump water into the interstitial space.
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Its length allows it to do this easily as water leaks out along the length.
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It becomes more and more narrow, forcing water to exit.
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Explanation:
Detailed explanation-1: -Water present in the filtrate in the papillary duct flows through aquaporin channels out of the duct, moving passively down its concentration gradient. This process reabsorbs water and creates a concentrated urine for excretion.
Detailed explanation-2: -The ascending limb of the loop of Henle permeable to water. The descending limb of the loop of Henle is permeable to electrolytes.
Detailed explanation-3: -Reason: The descending limb of loop of Henle is impermeable to both water and electrolytes.
Detailed explanation-4: -If the ascending limb of the loop of Henle were permeable to water, this process would be impossible and the filtrate would not be concentrated in the collecting duct.
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