Q. Which of the following statements is/are true? I. Urine is hypertonic in distal convoluted tubule. II. When the urine passes into the collecting tubule, it becomes hypotonic. III. Urine is isotonic in proximal convoluted tubule. IV. Urine becomes more and more hypotonic as it passes through the Henle’s loop.
A) I and IV
B) I, II and III
C) II and III
D) I only
Explanation
The kidneys have a special mechanism for concentrating the urine, it is called counter current mechanism. The animals which excrete hypertonic urine have longer loop of Henle.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.