自由基系指外层轨道含有未配对电子的原子、原子团或特殊状态的分子,体内许多代谢过程都可自发地产生。它既参与一些有益的生命活动环节,又参与生物体的病理生理损伤过程。据认为自由基与肺损伤有密切关系,但正常情况下在体内抗氧化系统的作用下,自由基又不断地被清除,从而维持机体的动态平衡。 Free radical refers to the outer orbit contains unpaired electron atoms, atomic groups or special state molecules, many metabolic processes can be spontaneously generated. It not only participates in some useful life activities, but also participates in the process of pathophysiological damage in the organism. It is believed that free radicals and lung damage are closely related, but under normal circumstances in vivo antioxidant system, free radicals are constantly being removed, so as to maintain the body’s dynamic balance.