Measurement of the rate of creatinine clearance is used as a key determinant of renal function. In which of the following tissues is creatinine generated?
  1. Adipose
  2. Kidney
  3. Liver
  4. Skeletal muscle
Explanation
Answer: D - Although creatine is synthesized in the liver from guanidoacetate, which is produced in the kidneys, it is not used by these two tissues. Once synthesized, creatine is transported to cardiac and skeletal muscle, where it is phosphorylated and stored for future energy needs.
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