Study the following statements.
a) Collecting duct allows passage of small amounts of urea into the medullary interstitium to keep up the osmolarity.
b) NaCl is transported by the ascending limb of Henle’s loop which is exchanged with the descending limb of vasa recta.
c) An increase in body fluid volume can switch on the osmoreceptors and promote the ADH release to complete the feedback.
d) Angiotensin II activates the adrenal medulla to release aldosterone.
Which of the above are incorrect?