Taking antibiotics for a long time-people's resistance drops.
Heavy use of pesticides-increased resistance to pests and diseases
Extensive use of inorganic fertilizers-soil degradation
Harm of organic chemicals:
1. The effects of formaldehyde on human health are mainly manifested in abnormal sense of smell, irritation, allergy, abnormal lung function and abnormal immune function.
2. Harm of benzene to human health It is generally believed that benzene poisoning is caused by metabolites, which means that benzene must be metabolized to be harmful to life. Benzene can be metabolized in liver and bone marrow, and bone marrow is the place where red blood cells, white blood cells and platelets are formed, so benzene can enter the body and form metabolites with blood toxicity in hematopoietic tissue itself.
3. The harm of toluene to human health About 48% of toluene is metabolized in the body and eventually excreted through the liver, brain, lung and kidney, which will do harm to the nervous system in this process.
4. Harm of Xylene to Human Health Xylene includes ortho-,meta-and para-isomers, among which meta-isomer accounts for the largest proportion, up to 60%~70%, and para-isomer accounts for the lowest proportion. Xylene can be absorbed through respiratory tract, skin and digestive tract, and its vapor enters human body through respiratory tract, and some of it is discharged through respiratory tract. The absorbed xylene is most distributed in adipose tissue and adrenal gland, followed by bone marrow, brain, blood, kidney and liver.