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Attempts 127

What is urea?

  1. A
    Colorless liquid in urine
  2. B
    End product of protein metabolism
  3. C
    Molecule produced by the kidneys
  4. D
    Fluid stored in the bladder

Topic Flashcards

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Question

In which organ is urea primarily synthesized?

Answer

The liver.

Question

What is the name of the metabolic cycle in the liver that converts toxic ammonia into urea?

Answer

The urea cycle (ornithine cycle).

Question

What is the primary nitrogenous waste product in human urine?

Answer

Urea.

Question

Elevated blood urea nitrogen (BUN) is often a laboratory indicator of dysfunction in which two organ systems?

Answer

The kidneys (excretion) and/or the liver (production).

Question

Why must toxic ammonia produced from protein breakdown be converted to urea?

Answer

Ammonia is highly toxic to cells, especially neurons. Urea is a less toxic, water-soluble compound that can be safely transported in blood and excreted by the kidneys.

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Urea is the primary waste product of carbohydrate metabolism.
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