In what ways can harmful substances enter the human body?

firstly, through the respiratory tract through the skin epithelial tissue, also through the nasopharynx, but most bacteria and viruses enter our body, first getting on the skin, and then the person himself carries them through his body without washing his hands and touching his mouth, for example.



One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.