Question

what is creatinin?

Answer 1

creatinine is a protein obtained from degradation of creatinine phosphate present in the muscle.

Answer 2

Probably this: http://en.wikipedia.org/wiki/Creatinine

Answer 3

Creatinine (from the Greek ''kreas'', flesh) is a break-down product of creatine phosphate in muscle, and is usually produced at a fairly constant rate by the body (depending on muscle mass).