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Talking about amino acids, of course, protein is inseparable. As the first nutrient element in the body, protein has an obvious role in food nutrition, but it cannot be used directly in the human body, but is transformed into small amino acid molecules. Used. That is, protein is not directly absorbed by the human body in the human gastrointestinal tract, but through the action of a variety of digestive enzymes in the gastrointestinal tract, the high molecular protein is broken down into low molecular weight polypeptides (dehydration and condensation of 10 to 100 amino acids). The resulting compound can be understood as consisting of 10-100 amino acids) or after the amino acids, they are absorbed in the small intestine and enter the liver along the hepatic portal vein.
Part of the amino acids are decomposed or synthesized in the liver; the other part of the amino acids continue to be distributed with the blood to various tissues and organs, free to choose, and synthesize various specific tissue proteins. Under normal circumstances, amino acids enter the blood and their output speed is almost the same, so the content of amino acids in the blood of normal people is quite constant. For example, in terms of amino nitrogen, the content per 100 ml of plasma is 4 to 6 mg, and the content per 100 ml of blood cell is 6.5 to 9.6 mg. After a meal of protein, a large amount of amino acids are absorbed, and the level of amino acids in the blood temporarily rises. After 6 to 7 hours, the content returns to normal. It shows that the metabolism of amino acids in the body is in dynamic balance, with blood amino acids as its balance hub, and the liver is an important regulator of blood amino acids. Therefore, food protein is digested and decomposed into amino acids and then absorbed by the body, and antibodies use these amino acids to synthesize their own proteins. The body's need for protein is actually the need for amino acids.