ANIMAL PHYSIOLOGY
OSMOREGULATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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ADH causes specific protein channels to move into the membranes of certain cells in the nephron so that more water can be absorbed by osmosis. What are these called?
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aquaporins
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active transport
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tight junctions
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desmosomes
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Explanation:
Detailed explanation-1: -The aquaporin 2 water channel plays an essential role in maintaining the body’s water balance. The placement of these channels is controlled by a hormone called vasopressin or antidiuretic hormone (ADH).
Detailed explanation-2: -Aquaporins are channels, i.e. passive transporters where water always moves down its water potential gradient.
Detailed explanation-3: -AQP1 is extremely abundant in the proximal tubule and descending thin limb and is essential for urinary concentration. AQP2 is exclusively expressed in the principal cells of the connecting tubule and collecting duct and is the predominant vasopressin-regulated water channel.
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