The liver produces several chemicals (enzymes) that change ammonia into a form called urea, which the body can remove in the urine.

Why is urea formed in the body and where is it formed?

Urea forms when dietary proteins make amino acids after digestion. The liver breaks down excess amino acids to make ammonia, then converts this into urea, which is less toxic in the body than ammonia.

What is the site of urea formation?

The liver is the only site where urea is synthesized and ultimately excreted by the kidneys.