Question

Which of the following is not a function of kidneys?
A. Regulation of blood pressure
B. Removal of urea
C. Regulation of acidity of fluids
D. Secretion of antibiotics

Answer 1

Hint: The excretory system is responsible for removal of wastes from the body. The excretory system of humans consists of a pair of ureters, a pair of kidneys, urinary bladder and urethra.

Complete answer:
 The kidneys are chief excretory organs and their major function is excretion of urea in the form of urine. The kidneys are made up of nephrons.

Option A: When a change in the blood volume is seen, the osmoreceptors are activated and they trigger the release of vasopressin or ADH. ADH has an effect on constriction of the blood vessels which results in increase of blood pressure and increases the blood flow. Thereby, kidneys have a role in regulation of blood pressure. Therefore, this is the incorrect option.

Option B: Kidneys are involved in removal of urea in the form of urine. Urea from the blood is removed via the tiny filtering units present in the kidney which are known as nephrons.

Option C: The kidneys help in maintenance of acid- base balance as they secrete hydrogen ions into the urine and also reabsorb bicarbonate from the urine. Therefore, this is the incorrect option.

Option D: Kidneys are not involved in secretion of antibiotics. Antibiotics are basically a range of medicines which are used to inhibit the growth and also kill microorganisms. Therefore, this is the incorrect option.

Thus, the correct option is A) Regulation of blood pressure.

Note: The various organs involved in the process of excretory system are,
1. Pair of ureters - It is thin muscular tubes which come out of each kidneys and carry urine to the bladder from urine.
2. Pair of kidneys - They are bean shaped structures and are located on either side of the back bone. It consists of nephrons, capsule, and henle’s loop.
3. Urinary bladder - It is a sac like structure which helps in storage of urine.
4. Urethra - It is a tube like structure which arises from the urinary bladder and helps in expelling urine out of the body.