AIIMS 2018 Biology Formation of Excretory Products MCQ Question

Creatinine is produced from the breakdown of creatine phosphate in muscle tissue, where creatine is involved in energy metabolism. During intense physical activity, creatine phosphate donates a phosphate group to adenosine diphosphate (ADP) to regenerate adenosine triphosphate (ATP), resulting in the formation of creatinine as a byproduct. Option A, urea, is a waste product formed from the breakdown of proteins, while option B, uric acid, is produced from the metabolism of purines, and option D, the kidney, is involved in the excretion of creatinine but does not produce it.