Answer these 3 questions :

Question 1
One of the functions of the main cells of the collecting tubule is:

Question 1 options:

a) To secrete potassium ions in the tubular lumen with the help of the hormone aldosterone


b) To maintain the pH of the blood between (7.35 - 7.45)


c) To secrete sodium ions in the tubular lumen with the help of the hormone aldosterone


d) Reabsorb sodium using antidiuretic hormone


e) Reabsorb water with the help of the hormone aldosterone

Question 2
The granulocyte which secretes histamine and other inflammatory mediators is:

Question 2 options:

a) A lymphocyte


b) A neutrophil


c) A basophil


d) An eosinophil


e) A dendritic cell

Question 3
About the counter-current exchanger mechanism, which sentence (s) is (are) wrong:

Question 3 options:

a) One of the actions of the vasa recta is to bring oxygen and nutrients into the medullary interstitium and remove metabolic waste


b) The ascending and descending branches of the vasa recta are permeable to NaCl and urea


c) The ascending and descending branches of the vasa recta are permeable to water


d) None of the answers (a, b and c) are wrong


e) All of the above (a, b and c) are false