Question

The formation of urea takes place in the

• A. Lungs
• B. Kidneys
• C. Heart
• D. Liver

Answer 1

The correct option is D

Liver

The correct option is D.

Explanation for correct option:

1. The liver is an internal organ located in the upper right part of the abdomen, below the diaphragm.
2. It plays a vital role in the metabolic functions of the body and immune system.
3. Toxic ammonia is catabolized into urea in the liver. The urea cycle begins in the mitochondria of hepatocytes and ends in the cell's cytoplasm.
4. Ammonia is converted into carbamoyl phosphate and undergoes four enzymatic reactions in the hepatocyte to generate urea.

Explanation for incorrect option:

Option A:

1. The lungs are the central part of the respiratory system and are involved in the exchange of gases.
2. They help in the transport of oxygen derived from the atmosphere into the bloodstream for circulation.

Option B:

1. Kidneys are bean-shaped organs that help remove wastes from the body.
2. They play a crucial in maintaining homeostasis and managing the electrolyte balance in the body.

Option C:

1. The heart is a muscular organ that pumps blood via the circulatory system throughout the body.
2. It ensures the maintenance of adequate blood pressure in the blood vessels.

Final answer: The formation of urea takes place in the liver.