Sebaceous glands secrete sebum which contains lactic acid and fatty acids to dissolve bacterial membranes. 

Lactic Acid

Defensins function to destroy bacterial membranes, viral extracellular structures and fungi. 

Defensins

Lysozymes are enzymatic proteins that degrade bacterial cell walls.

Lysozymes

Tulane University

The innate immune system contains many proteins and molecules that are essential to extracellular, and therefore intracellular, defense. The epithelial cell lining of the gastrointestinal and urogenital tract contain mucosal membranes and antimicrobial substances that prevent a pathogen from causing severe damage to the individual's health. 

Extracellular Processes

Parham, P. (2009). Vaccination to Prevent Infectious Disease. In 1145902806 862124677 J. Foltin (Ed.), The Immune System (3rd ed., pp. 62-65). New York, New York: Garland Science, Taylor & Francis Group.

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