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答:这些酶的结构本质均属蛋白质,完成自己的消化作用后,最终还是被分解吸收了。唾液淀粉酶入胃后,继续作用15-30分钟而失效,就有部分被蛋白酶分解。胃蛋白酶的适宜环境是pH=1.8左右的强酸性,入小肠后,环境逐渐改变而失效,它同样部分被其他酶(如胰、糜蛋白酶)分解。胰液中的各种酶和小肠腺分泌的各种酶,随着消化产物及废物的积累,环境条件逐渐改
A: The nature of the structure of these enzymes are proteins, to complete their own digestion, the final is still absorbed. Saliva amylase into the stomach, continue to function 15-30 minutes and failure, there are some protease decomposition. The optimum environment for pepsin is strong acidity of pH = 1.8. After entering the small intestine, the environment gradually changes and becomes ineffective. It is also partially decomposed by other enzymes (such as pancreatic and chymotrypsin). Various enzymes in pancreatic juice and various enzymes secreted by the intestinal glands, with the accumulation of digestion products and waste, environmental conditions gradually changed