Question

Which of the following statements is/are correct?
I. Urine is hypertonic in distal convoluted tubule.
II. When the urine pases into the collecting tubule, it becomes hypotonic.
III. Urine is isotonic in Proximal Convoluted Tubule (PCT).
IV. Urine becomes more and more hypotonic as it passes throught the Henle's loop.
Select the correct answer using the codes given below.

• A. I and IV
• B. I, II and III
• C. II and III
• D. Only III
• E. Only I

Answer 1

The correct option is D Only III

Only option III is correct as in PCT the urine is isotonic. In DCT, it is isotonic. In collecting tubule it is hypertonic while in Henle's loop it is hypertonic.