At which position (marked as 1, 2, 3, 4, 5 and 6) does antidiuretic hormone (ADH) affect the permeability of membranes to water?
A) 1 and 2
B) 3 and 4
C) 2 and 3
D) 5 and 6
Correct Answer: D
Solution :
[d] ADH increases the permeability of the distal convoluted tubules and the collecting duct to water by increasing the number of water channels in membranes lining tubules. It also increases the permeability of the collecting duct to urea, which increases the concentration of medullary tissue fluid, resulting in more water being, removed in the descending limb.
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