ANIMAL PHYSIOLOGY
EXCRETION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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osmoreceptors no longer stimulate ADH production
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urine becomes dilute
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ADH travels through blood until reaching ADH receptors on cell membranes of collecting ducts
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aquaporins fuse to membrane
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Detailed explanation-1: -Answer and Explanation: The correct answer: The statement that the aquaporins are cells that line the PCT and affect water retention is True.
Detailed explanation-2: -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.
Detailed explanation-3: -The primary function of most aquaporins is to transport water across cell membranes in response to osmotic gradients created by active solute transport.
Detailed explanation-4: -Aquaporins (AQPs) are a newly recognized family of transmembrane proteins that function as molecular water channels. At least four aquaporins are expressed in the kidney where they mediate rapid water transport across water-permeable epithelia and play critical roles in urinary concentrating and diluting processes.