Which of the following is not a function of the urinary system?

Excretion of water-soluble vitamins

Helps to regulate water content of the body

Contributes to acid-base balance of the blood

Excretion of fat-soluble vitamins

Option (4)

Explanation:

The urinary system is one of the important systems in the human body. The main body parts associated with this system are the kidneys, the ureter, bladder, and the urethra.

Its prime objective is to maintain the water content within the body, helps in balancing the acid-base proportion in the body, eliminates the vitamins that are water-soluble, also helps in maintaining the blood pressure.

The excretion of the vitamins that are fat-soluble, is not a function of the urinary system. It is because the fatty substances are excreted from the body at a very slow rate. They are mostly absorbed by the liver, tissue and some amount of it are absorbed by the small intestine. It can cause toxicity in the body as they are eliminated slowly.

Thus, the correct answer is option (4).