defense against pathogens

• what is the respiratory system lined with

  mucus and cilia
• how does mucus and cilia defend against pathogens 


  it traps the particles which contain pathogens and the cilia wafts the mucus to the back of the throat to be swallowed
• the skin acts as a barrier to pathogens and is the largest organ in the body
• how do platelets defend against pathogens 


  platelets clump together to plug the wound (blood clotting) this prevents microorganisms entering the blood
• how do eyes defend against pathogens 


  they produce tears which is an enzyme called lysosome which breaks down bacteria in the surface of the eye
• how does saliva defend against pathogens 


  contains molecules which kill pathogens that enter the mouth
• how does the stomach defend against pathogens

  it produces hydrochloride acid which kills pathogens