THORAX ABDOMEN AND PELVIS

Detailed explanation-1: -Urea is excreted by the kidneys and is the result of the breakdown of amino acids from proteins. You’ll recall that amino acids are the monomer subunits of proteins. When amino acids are broken down, the amino group is converted into a toxic substance called ammonia.

Detailed explanation-2: -The degradation product of urea, ammonia, is known to be toxic to all vertebrates. In neutral and acidic conditions, however, ammonia exists in the form of ammonium.

Detailed explanation-3: -Amino acids may also be metabolized through the liver to form urea, which is then excreted in the urine. Body protein stores can be converted back to essential and nonessential amino acids or may be metabolized, forming waste products and ions, which, as previously detailed, are excreted in the urine.

Detailed explanation-4: -Some of these chemical byproducts such as Ammonium and Urea can be harmful if they accumulate in the body and the kidneys excrete these waste products as chemicals in the urine.