Question

What is difference between urea and urine

Answer 1

Urea vs Urine

There are differences between urea and urine though both are considered as the nitrogenous waste products that are excreted through the urinary system in animals. Metabolism of amino acids and nucleic acids results in nitrogenous wastes. When these acids are metabolized, ammonia is formed as the immediate by-product, which is quite toxic to cells and should be excreted from the body. Creatures like bony fish and many aquatic invertebrates excrete their nitrogenous waste directly as ammonia. However, in mammals, amphibians and cartilaginous fish, ammonia is quickly converted into urea by their liver and excreted as urine through the excretory system. Urea is less toxic when compared to ammonia. Birds and terrestrial reptiles excrete their nitrogenous waste in the form of uric acid. Though the production of uric acid involved more energy, it conserves a lot of water.

Answer 2

urea is first produced in the liver through the metabolism of nucleic acids and amino acids

urine is produced in the kidneys through the urination