Which of the following is not a feature of a counter-current mechanism?

In which renal tubule, the reabsorption is minimum?

What is the percentage of urea present in the urine?

Which of the following substances are not secreted by the tubular cells?

Nearly 75% of the filtrate is reabsorbed by the renal tubules.

Which of the following is the term given to the condition of RBCs in urine?

What is uraemia?

Which of the following is released by JG cells when GFR falls its normal levels?