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HomeHomework HelpbiologyNitrogenous Waste Types

Nitrogenous Waste Types

Nitrogenous wastes are metabolic byproducts containing nitrogen, primarily produced from the breakdown of proteins and nucleic acids. The three main types are ammonia, which is highly toxic and water-soluble; urea, which is less toxic and excreted by mammals; and uric acid, which is even less toxic and excreted as a paste by organisms such as birds and reptiles to conserve water.

intermediate
2 hours
Biology
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Nitrogenous wastes are essential byproducts of protein metabolism that need to be excreted to maintain homeostasis in organisms. The three primary types of nitrogenous wastes—ammonia, urea, and uric acid—vary in their toxicity and water solubility, influencing how different species manage waste. Aqu...

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Key Terms

Nitrogenous Waste
Waste products containing nitrogen that are produced from the metabolism of proteins.

Example: Ammonia, urea, and uric acid are all nitrogenous wastes.

Ammonia
A highly toxic nitrogenous waste that is soluble in water.

Example: Fish excrete ammonia directly into the water.

Urea
A less toxic nitrogenous waste formed in the liver, excreted by mammals.

Example: Humans excrete urea in urine.

Uric Acid
A nitrogenous waste that is less toxic and conserves water, excreted as a paste.

Example: Birds excrete uric acid to save water.

Excretion
The process of removing waste products from the body.

Example: Excretion is essential for maintaining homeostasis.

Toxicity
The degree to which a substance can harm organisms.

Example: Ammonia has high toxicity compared to urea.

Related Topics

Protein Metabolism
Study of how proteins are broken down and utilized in the body, including nitrogenous waste production.
intermediate
Homeostasis
Understanding how organisms maintain stable internal conditions, including waste management.
intermediate
Animal Physiology
Exploration of how different animal systems function, including excretory systems.
advanced

Key Concepts

AmmoniaUreaUric AcidExcretion