Final answer:
The correct spelling for the term is 'creatinine', not 'cretatinine'. Creatinine is a waste product from muscle metabolism that is excreted by the kidneys.
Step-by-step explanation:
The correctly spelled term is creatinine. This term refers to a waste product produced by muscles from the breakdown of a compound called creatine. Creatinine is filtered out of the blood by the kidneys and excreted in urine. The incorrect option given is cretatinine, which contains an extra 't' and is not the correct spelling of the word.
When ensuring the correct spelling of a word, it's helpful to ask yourself questions such as:
- Am I sure this is the right word to express my idea?
- To the best of my knowledge, did I spell it correctly?
If there's any doubt, it's always useful to check a dictionary to confirm the correct spelling of the word.