APPLIED RADIOLOGICAL ANATOMY

Detailed explanation-1: -The skin, mucous membranes, and endothelia throughout the body serve as physical barriers that prevent microbes from reaching potential sites of infection.

Detailed explanation-2: -The tear fluid creates a chemical barrier at the surface of the eye as part of the innate immune system, which provides protection against pathogens by secreting antibacterial and immunomodulatory proteins (AMPs) that inhibit bacterial growth [28].

Detailed explanation-3: -The skin covers almost all parts of your body to prevent infection from pathogens. The nose has internal hairs, which act as a physical barrier to infection. Other cells called goblet cells create the mucus in order to trap pathogens.