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immune system - Coggle Diagram

- - - - prevent all foreign agents from entering the body
      - mechanical barrier
        
        skin - physical wall that keeps foreign substances out
        
        hair in nasal cavity traps inhaled particles
        
        cilia in respiratory tract sweeps dust and bacteria-laden mucus towards mouth to be expelled
      - chemical barrier
        
        acidic pH of skin inhabit bacterial growth
        
        sebum - oils in hair is toxic to bacteria
        
        earwax traps foreign particles
        
        vaginal secretions- are very acidic to kill bacteria
        
        stomach mucosa
        
        secretes hydrochloric acid
        
        has protein digesting enzymes
        
        saliva and tears contain lysozymes(enzymes that kill bacteria)
        
        sticky mucus from mucosa of respiratory and digestive tract produce traps microorganisms