summary of nonpecific body defense mechanisms ::
Associated elements
surface membrane barriers protective non specific mechanism
Intact skin epidermis Forms mechanical barrier to prevent entry of pathogens and other harmful substances into body
Acid mantle skin secretions (perspiration and sebum) make epidermal surface acidic and inhibit bacterial growth sebum also contains bactericidal chemicals
Keratin provides resistance against acids alkalis and bacterial enzymes
Intact mucous membranes Form mechanical barrier that prevents entry of pathogens
mucus Traps micro - organisms in respiratory and digestive tracts
Nasal hairs Filter and trap microorganisms in nasal passages
Cilia Propel debris - laden muscus away from lower respiratory passages
Gastric juice Contains concentrated hydrochloric acid and protein - digesting enzymes that destroy pathogens in stomach
Acid mantle of vagina Inhibits growth of bacteria and fungi in female reproductive tract
Lacrimal secretion (ters) saliva continously lubricates and cleanse eyes (tears) and oral cavity (saliva) contains lysozyme an enzyme that destroys microorganisms
Urine Normally acid pH inhibits bacterial growth cleanses the lower urinary tract as it flushes from the body
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