Question

Which of the following statement(s) is/are true?

• A. Urine is hypertonic in distal convoluted tubule
• B. When the urine passes into collecting tubule, it becomes hypotonic.
• C. Urine becomes more and more hypotonic as it passes through Henle's loop
• D. Both (a) and (c)

Answer 1

The correct option is D

Both (a) and (c)

Explanation of the correct option:

The correct option is D:

1. The process by which the urine is formed by the nephrons is called uropoiesis.
2. If the solution concentration is higher inside than in the surrounding, then it is known as hypertonic.
   If the solution concentration is lower inside than in the surrounding, then it is known as hypotonic.
3. In the distal convoluted tubule, the urine is hypertonic since its concentration is high.
4. And as it passes through Henle's loop, the urine becomes more hypotonic, that is the concentration reduces.
5. Hence, both options (A) and (C) are correct.

Option A:

1. The concentration of urine is higher in the DCT and hence it is hypertonic.
2. But not only option (A) is true.

Option B:

1. When the urine passes into the collecting tubule, it becomes hypertonic, not hypotonic.

Option C:

1. As the urine passes through Henle's loop, it becomes more hypotonic, that is the concentration reduces.
2. But not only option (C) is true.