What effect does antidiuretic hormone (ADH) have on the nephron?
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Question

What effect does antidiuretic hormone (ADH) have on the nephron?
a. It increases water permeability of the descending limb of the loop of Henle.
b. It decreases water permeability of the descending limb of the loop of Henle.
c. It increases water permeability of the collecting duct.
d. It decreases water permeability of the collecting duct.

Accepted Answer

Hey everyone. Let's take a look at this question together. The water permeability of the collecting ducts is increased by what. So we're trying to figure out how can we increase the permeability of the collecting ducts? Which we know the collecting ducts are found within the kidneys. So when we're talking about that water permeability we are talking about the aqua por ins which are the channels within the renal collecting duct that have to do with water reabsorption. So when we want to increase the permeability we basically want an increase of re absorption within the kidneys. So to do so we know that we have to use a hormone called vaso present. And what vasopressin does is it binds to the receptors and it enhances that water reabsorption or increases it by opening up those aqua porn channels more. And so vasopressin is also called an anti diuretic hormone or A. D. H. And so the correct answer here is answer choice D. Because vasopressin is the hormone that binds to the receptors of the cells in the collecting ducts in the kidneys and it promotes that re absorption of water which then increases the water permeability. So answer choice D. Is the correct answer. I hope you found this video helpful. Thank you and goodbye

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