List any three types of Innate Immunity barriers and give an example for each

Explanation

a) Physical barriers
These barriers do not allow pathogens and foreign agents to enter the body, eg., skin, mucous membranes of digestive, respiratory and urinogentical tracts trapping micro- organisms.
b) Physicological barriers Sweat, tears, acid in the stomach and saliva prevent microbial growth
c) Cellular barriers WBCs (Polymorphonuclear leukocytes and monocytes, natural killer lymphocytes) and macrophages phagocytose and destroy microbes.
d) Cytokine barriers Interferons produced by virus - infected cells prevent from further viral infection