PATHOLOGY

Detailed explanation-1: -The closed surface of the skin and of all mucous membranes already forms a physical barrier against germs, which protects them from entering. Additionally, chemical substances like acid, enzymes or mucus prevent bacteria and viruses from gaining a foothold.

Detailed explanation-2: -The primary barrier to the entrance of microorganisms into the body is the skin. Not only is the skin covered with a layer of dead, keratinized epithelium that is too dry for bacteria in which to grow, but as these cells are continuously sloughed off from the skin, they carry bacteria and other pathogens with them.

Detailed explanation-3: -A physiological barrier is a sort of barrier that keeps germs and pathogens out of the human body. Tears, saliva, skin, the stomach’s acidic pH, and bile in the intestine all are examples of physiological barriers. An innate immune system acts as a physiological barrier.