Multiple choice

A person is undergoing prolonged fasting. His urine will be found to contain abnormal quantities of

  1. fats

  2. amino acids.

  3. ketones

  4. glucose.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

  A person is undergoing prolonged fasting. His urine will be found to contain abnormal quantities of ketones. Ketones are metabolic end-products of fatty acid metabolism. In healthy individuals, ketones are formed in the liver and are completely metabolized so that only negligible amounts appear in the urine. However, when carbohydrates are unavailable or unable to be used as an energy source, fat becomes the predominant body fuel instead of carbohydrates and excessive amounts of ketones are formed as a metabolic byproduct. Higher levels of ketones in the urine indicate that the body is using fat as the major source of energy.

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