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Question

Which of the following statement is/are true?
1.Urine is hypertonic in distal convoluted tubule.
2.When the urine passes into collecting tubule, it becomes hypotonic.
3.Urine is isotonic in proximal convoluted tubule.
4.Urine becomes more and more hypotonic as it passes through Henle's loop.

A
1 and 4
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B
1, 2 and 3
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C
2 and 3
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D
3 only
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E
1 only
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Solution

The correct option is D 3 only
The glomerular filtrate contains all the materials present in the blood except blood cells and most proteins, which are too large to cross the basement membrane of the glomerulus. Hence, the filtrate is isotonic to blood plasma in the proximal convoluted tubule.
So, the correct answer is option A.

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