innate Immunity is the defense system in which you were born with and it protects the body against all antigens first line of defense includes chemical and physical barriers that are always ready and prepared to defend the body from infection second line of defense is non specific that level attack in a generalized way without targeting specific individuals third line of defense specific immune immune cells that target particular antigens antimicrobial peptides a class of small peptides that widely exist in nature and are vital part of the innate immune system of various different organisms lysozyme is naturally occurring enzymes found in bodily secretions and they act as microbial agent by cleaving the peptidoglycan component of bacterial cell walls