Muscle used for energy Liver Used for energy, converted to triglycerides changed to other molecules. Proteins are broken down into amino acids when digested These amino acids can be used by cells to make cell proteins or plasma proteins. They can be made into other nitrogen derivatives. They can be turned into fats or carbohydrates. Some amino acids can be converted into other amino acids.
Excess protein is turned into fat or carbohydrate which is either used or stored.
There is no storage protein. This urea then goes to the kidneys to be excreted as metabolic waste. This occurs only if the membrane threshold is met. If not, there is only a local depolarization. Information contained on this page does not represent the lecture verbatim.