Mastering A&P Urinary System Test 2025 – 400 Free Practice Questions to Pass the Exam

Question: 1 / 400

What is urea, and why is it significant in the urinary system?

A waste product from carbohydrate metabolism

A nitrogenous waste from protein metabolism

Urea is a nitrogenous waste product that is primarily formed from the breakdown of proteins in the liver. It represents the body's way of excreting excess nitrogen, which arises from the metabolism of amino acids. This process is crucial because excess nitrogen can be toxic to the body. Once produced, urea is released into the bloodstream and filtered out by the kidneys, where it is subsequently excreted in urine.

The significance of urea in the urinary system lies not only in its role as a waste product but also in its contribution to the regulation of nitrogen balance in the body. By converting ammonia, a highly toxic compound, into urea, the body can safely eliminate excess nitrogen while minimizing harm. This ability to manage waste products is essential for maintaining homeostasis and ensuring overall metabolic stability.

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A key electrolyte in urine

A type of hormone produced by the kidneys

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