NEET BIOLOGY

Detailed explanation-1: -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-2: -This very important metabolic process is called deamination. In the hepatocytes, NH2 (the amino group) quickly changes into ammonia NH3, which is highly toxic to the body. The liver acts fast to convert ammonia into urea that then can be excreted in the urine and eliminated from the body.

Detailed explanation-3: -With the help of specific catalysts in the liver cells carbon dioxide reacts chemically with the ammonia molecule, NH3. The less toxic nitrogenous compound urea is produced together with water. This series of reactions is called the ornithine cycle.

Detailed explanation-4: -In the human body, deamination takes place primarily in the liver, however it can also occur in the kidney. In situations of excess protein intake, deamination is used to break down amino acids for energy. The amino group is removed from the amino acid and converted to ammonia.

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.