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Question

Vasopressin released from the neurohypophysis is mainly responsible for

A
Facultative reabsorption of water through Henle's loop
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B
Obligatory reabsorption of water through Bowman's capsule
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C
Facultative reabsorption of water through DCT
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D
Obligatory reabsorption of water through PCT
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Solution

The correct option is C Facultative reabsorption of water through DCT
Facultative reabsorption is the removal of water in the distal convoluted tubule and collecting duct. It is regulated by the vasopressin (also called ADH) and the role of vasopressin is to make the collecting duct more permeable so that water can be osmotically drawn out of the filtrate. The conditions that favor maximizing facultative reabsorption are dehydration.

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