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How does the body prevent bacteria from entering?

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The Scientist:
The human body has several natural defences against bacteria. Some of these prevent bacteria from entering the body. Others act once the bacteria have entered.

Please provide examples in which the body stops bacteria from entering.

KNOW THE ANSWER? Please share your view here. Thank you. [:)]

tangoblue:
I dont know about preventing it from getting in, but the mitochondria has an outer membrane just to fool the cell into beliving its not something to attack, and has no other purpose.  This is quite interesting bwcause the mitochondria is obviously an essentian part of the cell, but without its outer membrane, it most likely would not be 'accepted' as part of the cell.

SteveFish:
Our skin is specifically evolutionarily designed to keep out foreign organisms by providing a tough barrier. In other regions, such as the respiratory and GI tracts where the body meets the outside world, there are regions just below the surface epithelia where Immune cells congregate in great numbers in "nodules" to protect against invasion. Some of the cell types associated with this diffuse immune system are aggressive attack cells, while others send out alarm molecules that recruit an immune response. Further, lymph nodes can mount an immune response from the lymph vessel system that monitors all areas of the body, and the spleen checks for invaders in the blood.   

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