环境中的铅,可经过各种途径进入人体,其中最主要的是消化道和呼吸道。当铅在人体内积蓄到一定数量时,可引起神经系统、造血系统和消化系统的病理改变。轻者可表现为头痛、耳鸣、幻听、失眠、抑郁及记忆力减退;重者则可出现四肢抽搐、谵妄、癫痫样惊厥及狂躁等症状严重时甚至可造成贫血、铅毒性肝病、脑病、肾炎及瘫痪。现代医学研究表明,长期从事 Lead in the environment can enter the body through various means, the most important of which are the digestive tract and the respiratory tract. When lead accumulates to a certain amount in the human body, it can cause the pathological changes of the nervous system, hematopoietic system and digestive system. Light can be manifested as headache, tinnitus, auditory hallucinations, insomnia, depression and memory loss; severe quadriplegia may occur limbs, delirium, epileptic convulsions and manic symptoms may even cause severe anemia, lead poisoning liver disease, encephalopathy, nephritis And paralyzed. Modern medical research shows that long-term