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A microorganism that can make a person ill is called a ……some types of bacteria …… , …… and ……. are pathogens. some pathogens can get into the body in food and drink. The stomach produces……. ……. which help to destroy these. The skin has a thick layer of……. that stops most pathogens getting into it. However if the skin is cut, pathogens may enter the blood. Blood……. helps to prevent this. Many of the pathogens that are present in the air that we breathe in are prevented from reaching the lungs, because they are trapped by sticky………that stops most pathogens getting into it. However, helps to prevent this. in the respiratory passages.
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