What happens when the filtrate passes through the ascending loop of Henle?

Inside the kidney, there are three zones.

Which of the following is not correct regarding PCT?

Which of the following is responsible for the secretion of ANF?

The urine formed is brownish.

Where do the DCTs of nephrons open into?

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

What does the question mark represents in the given figure?