The amount of T3 and T4 produced by the thyroid gland is controlled by the pituitary gland at the base of the brain. It does this by secreting thyroid stimulating hormone (TSH). When the levels of T4 and T3 fall, the pituitary secretes more TSH. When T4 and T3 levels rise, the pituitary secretes less TSH.
Ammonia is a chemical made by bacteria in your intestines while you process protein. Your body treats ammonia as a waste product. It turns it into glutamine and urea. Then the urea travels to the kidneys and is eliminated in your urine.Ammonia will build up if the liver is too damaged to get rid of urea.our body treats ammonia as a waste product. It turns it into glutamine and urea. Then the urea travels to the kidneys and is eliminated in your urine. Ammonia will build up if the liver is too damaged to get rid of urea.
In a healthy person, the liver supplies several enzymes to change nitrogen into urea, which is then removed from the body in urine. This entire process is called the urea cycle. The liver in a person with urea cycle disorder is missing an enzyme necessary to convert nitrogen into urea. As a result, ammonia, a highly toxic substance, builds up in the bloodstream and is not removed from the body. Untreated, the high amounts of ammonia can cause brain damage, coma and eventually death.