Question

The function of urea being produced as an excretory material in mammals and sharks is that

• A. It raises the pH level of the blood
• B. It sends signals from cells that produce it to other organs
• C. It provides energy to some cells and tissues
• D. It prevents ammonia from building up in the body
• E. It eliminates water from the bloodstream

Answer 1

The correct option is D It prevents ammonia from building up in the body

Build up of ammonia in the body is toxic and can lead to CNS diseases. Hepatic removal of ammonia in form of urea prevents the toxic build up of ammonia in mammals and shark and removes it from the body. Thus, the correct answer is D.