人类赖氧气才能得以生存,但亦深受其害。人体细胞在正常氧化还原代谢过程中,2分子氢与1分子氧结合还原成水。此时由于小部分氧原子所得电子不充分,未能全部与氢原子结合还原成水,产生少量性质活泼的活性氧,即氧自由基。活性氧损害细胞膜、促使蛋白酶活性下降、侵袭DNA导致基因 Human beings rely on oxygen to survive, but also suffer. In normal redox metabolism of human cells, 2 molecules of hydrogen combine with 1 molecule of oxygen to reduce water. At this point due to a small part of the oxygen atoms of the resulting electron is not sufficient, not all combined with the hydrogen atoms reduced to water, resulting in a small amount of lively reactive oxygen species, that oxygen free radicals. Reactive oxygen species damage the cell membrane, promote protease activity decreased, invasion of DNA lead to genes