Which of the following is/are function(s) of the kidney?
Excretion of urea.
Excretion of excess water.
Retention of water.
Excretion of salts.
The kidneys are a pair of bean-shaped organs on either side of our spine, below our ribs. The functions of the kidney are to excrete nitrogenous wastes such as urea, excrete excess water and salt; and retain water when the amount of water is low in the body.