Which of the following accurately describes kidney function?

a. Kidneys are directed by the presence of antidiuretic hormone to excrete more water in urine.

b. Kidney function is controlled by the blood's composition and hormones.

c. Kidneys can excrete salts, but not glucose.

d. Kidneys will excrete salts if you have too little in your blood.

C applies as the kidney must excrete salt in order to get rid of excess water. (Water chases salt) if there is too much salt in the body the urine will be much more concentrated then if the body had too much water. Glucose may kbly be excreted if there are problems with the kidney - some diabetics pee out glucose. D applies to some degree - salt will still be excreted but in very dilute amounts - as the water must chase something in order to be excreted.