1. Respiratory tract: It is the most common, most common and dangerous way for poisons to enter the body.
Toxins exist in the forms of gas, steam, smoke, dust, and fog in scientific research and production. Gases and vapors are in the molecular state and can directly enter the human alveoli, and the particle size of smoke, dust, and fog is less than 5 μm, especially less than At 3 microns, it can be directly inhaled into the alveoli.
The entire respiratory tract of a person has a great ability to breathe, so the absorption of poisons is rapid, and the toxic substances entering the body through the respiratory tract are directly distributed through the blood circulation to the entire body without the detoxification effect of the liver and the viscera.
Particles larger than 10 microns are trapped in the nasal cavity and upper respiratory tract and cannot enter the body.
Second, the skin: skin absorption in a variety of ways, through the non-invasive skin; percutaneous hole, percutaneous sweat glands; hair follicles and sebaceous glands.
The transdermal surface is the main method of skin absorption, and the fat-soluble and water-soluble toxic substances are easily absorbed by the body through the skin surface, such as benzene, organic phosphorus compounds, and the like.
The amount and speed of absorption of toxic substances through the skin, in addition to factors such as fat-soluble and water-soluble concentrations, are related to the operating environment's temperature, humidity, skin damage, and contact area.
Third, the digestive tract: in scientific research and production of toxic substances through the digestive tract into the human body is rarely seen, usually caused by misuse.
Some of the poisons that enter the respiratory tract are adhered to the nasopharyngeal area or mixed in the secretions, and are swallowed to enter the digestive tract, or due to poor hygiene habits, or in the laboratory where poisons are used, in the workshop, smoking, or taking food with contaminated hands. Causes poisons to enter the digestive tract.
The way poison enters the body
Toxic substances exist in a wide range of fields, from raw materials to products, from intermediate products to by-products, from the use of various chemicals to waste water, waste gas and other wastes. Therefore, the main route through which poisons invade the human body is the respiratory tract, skin, and digestive tract.