pancreas secretes digestive juices to further break proteins down. Muscle contractions of the SI mix and move digested proteins to absorption sites.
4. Liver: After being absorbed into the blood, the broken down proteins (or amino acids) are transported to the liver. Further amino acid breakdown, releases nitrogen-containing ammonia. The liver transforms this to urea, which is then brought to the kidney and excreted.
When you consume protein, gastric enzymes break down the long peptide chains into individual amino acids. These amino acids travel to the liver, which utilizes them for tissue repair, enzyme synthesis, and muscle growth.
However, your body cannot store excess amino acids for later use like it does with carbohydrates (stored as glycogen) or fats (stored as adipose tissue). The liver deaminates excess amino acids, removing their nitrogen groups and converting them into urea. The kidneys then filter this urea out of the bloodstream for excretion
