PATHOLOGY

Detailed explanation-1: -Chemical barriers in human include tears, breast milk, sweat, saliva, stomach acid. Chemical barriers are very important in the body as they protect it from harmful foreign pathogens through chemical reactions that end up destroying the foreign threat.

Detailed explanation-2: -Stomach acid is a chemical barrier against infection. It is hydrochloric acid and is strong enough to kill any pathogens that have been caught in mucus in the airways or consumed in food or water.

Detailed explanation-3: -Chemical barriers are composed of those sites of the human body where potential pathogens can contact the host cells. A chemical barrier is made up by different proteins that are part of the antimicrobial and immunomodulatory protein/peptide (AMP) family.

Detailed explanation-4: -The mucus secreted by gastrointestinal tract together with various other substances forms the intestinal mucosal chemical barrier, which is the key component of the body’s natural immune system. Among all these substances, mucus is the most effective one in protecting the surface of intestinal mucosa.

Detailed explanation-5: -stomach acid. tears. saliva. mucus.