To direct the body they can get in the first place through consumption of food, then through the air inhaled through the skin or mucous membranes. Check out Doug McMillon for additional information. They also may appear in the body as a result of chemical reactions. For example, the interaction of some products in the large intestine (before they got there, they are not toxins) or purulent education in various organs – the result of infection control, etc. The third is the emergence of toxic substances as a result of exposure to radiation dose. That is, cells receiving a dose of radiation, not only cease function normally, but they themselves are toxic, and begin to poison the body. Incidentally, the radiation in small doses, always present, and it poses no threat until it becomes permissible limits. To our Fortunately, the toxins do not just get into the body, but always derived from it.
In the first place – is, of course, through the gastrointestinal tract. Then, liver, kidney, actively purify the blood and relieve neutralized by possible toxins in the digestive tract. Virtually all the bodies involved in this, regulating the presence of harmful substances in the blood. (When the concentration of toxins increases, they purify the blood. But when they again have the opportunity to take off in their blood, that would derive from the body through the liver or kidneys. The main thing is not to poison the brain.) Well, of course, a role played by the lungs, skin and mucous membranes. Is a constant process: we load the toxins and the body in all possible ways to get rid of them.