How does Physical barriers that help prevent an individual from contracting diseases include .?

Physical barriers that help prevent individuals from contracting diseases include the skin, which acts as a protective shield against pathogens, and mucous membranes that line body cavities and trap harmful microorganisms. Other barriers include bodily secretions like saliva and tears, which contain antimicrobial properties. Additionally, cilia in the respiratory tract help to expel foreign particles and pathogens. Together, these barriers form the first line of defense against infections.