Question

Which of the following statement is/are true?
I. Urine is hypertonic in distal convoluted tubule
II. When the urine passes into collecting tubule,
it becomes hypotonic.
III. Urine is isotonic in proximal convoluted tubule.
IV.Urine becomes more and more hypotonic as it
passes through Henle's loop.
X​

Answer 1

I think 2 one is the answer

Explanation:

because in collecting duct collecting tubule there is more concentration of urine at that time

Answer 2

The correct answer is a and c.

nephron is the structural and functional unit of the kidney. Its body is divided into renal corpuscle, proximal convoluted tubule, Henle's loop and distal convoluted tubule (DCT).

PCT is lined with cuboidal epithelium with brush border. It increases the surface area for absorption. Almost all essential nutrients and 70-80 % of electrolytes and water are reabsorbed by PCT with small changes in luminal osmolarity. Hence urine is isotonic in the proximal convoluted tubule.

The ascending limb of Henle's loop is impermeable to water and permeable to electrolytes. The ascending limb of the loop of Henle passes filtrate into DCT. hence urine is hypotonic to DCT.

So, the correct answer is 'a and c only'.

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