Ammonia is excreted by some organisms called ammonotelic such as aquatic amphibians.
All the living organisms eliminate their body waste and other toxic or excess waste in various ways that reside on the earth. Removal of nitrogenous waste products formed during metabolism from the body of a human is called excretion. Normally excretion means the release of nitrogenous excretory substances like urea Ammonia uric acid etc. Ammonia is excreted by some organisms called ammonotelic such as aquatic amphibians. Urea is excreted by some organisms called ureotelic such as terrestrial amphibians. While uric acid is excreted by some organisms called uricotelic such as reptiles. From all the excretory waste, urea is the least toxic and ammonia is the most toxic.
Skin: The oil gland and sweat glands found in the skin respectively secretes sebum and sweat. Liver: Liver cells play the main role in excretion by converting more and more amino acids and ammonia of blood into urea. Lungs: The lungs excrete two types of gaseous substance carbon dioxide and water vapor. The excretion of some substances like garlic, onion, and some species in which the vapor component is present is excreted by the lungs. FAQ (Frequently Asked Questions)
Mechanism of urine concentration (Countercurrent mechanism of urine concentration).
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