一、机体内自由基的形成、清除与其不平衡性 (一)机体内自由基的形成人类机体因处于外环境与内环境的复杂情况下,体内是可以经常不断地产生自由基的。自由基的形成可分为生理性的和病理性的二方面: 1.生理性的机体在进行细胞呼吸时,呼吸链上氧化还原酶系由于电子传递的结果,经常产生一些超氧阴离子自由基。另外,有些氧化酶如黄嘌呤氧化酶作用时也会产生机体内的吞噬作用、免疫反应均能产生;机 First, the formation of the body free radicals, clearance and its imbalance (A) the formation of free radicals in the body Due to the external environment and the internal environment of the complex situation, the body can often continue to produce free radicals. The formation of free radicals can be divided into two physiological and pathological aspects: 1. Physiological body during cellular respiration, respiratory chain oxidoreductase due to electron transfer results, often produce some superoxide anion free radical . In addition, some oxidases such as xanthine oxidase also produce the body phagocytosis, the immune response can produce; machine