What is excretion?
Excretion is the removal of metabolic waste products from cells.
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What are the main metabolic waste products in mammals?
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What is deamination?
Deamination is the process where the liver removes the amine groups from excess amino acids, producing ammonia and a keto acid.
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Why is ammonia converted to urea in humans?
Ammonia is highly toxic and soluble, interfering with metabolic processes and cell signalling, so it is converted to urea, which is less soluble and less toxic.
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How is urea removed from the body?
Urea diffuses from liver cells into the blood plasma.
As the blood passes through the kidneys, the urea is filtered out and removed from the body as a part of urine.
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