AP BIOLOGY

Detailed explanation-1: -Urea is produced in the liver and is a metabolite (breakdown product) of amino acids.

Detailed explanation-2: -The liver produces several chemicals (enzymes) that change ammonia into a form called urea, which the body can remove in the urine. If this process is disturbed, ammonia levels begin to rise. Several inherited conditions can cause problems with this waste-removal process.

Detailed explanation-3: -Bile is the excretory product produced in the liver, it helps in maintaining the chemical levels in the blood and removing the waste away with digestive wastes. These are eliminated from the body and thus help in excretion. It maintains the level of amino acids in the blood.

Detailed explanation-4: -In humans and mammals, almost 80% of the nitrogen excreted is in the form of urea, which is produced through a series of reactions occurring in the cytosol and mitochondrial matrix of liver cells. These reactions are collectively called the urea cycle or the Krebs-Henseleit cycle.

Detailed explanation-5: -The liver is where urea is created. The urea cycle is a cyclic mechanism that produces urea from ammonia, carbon dioxide, and aspartate.