Changes

===Biochemical Barriers===

===Biochemical Barriers===

Where there are breaks in the skin that are open to the outside environment the body has an armoury of biochemical barrieres that can stop infection. These are:  

Where there are breaks in the skin that are open to the outside environment the body has an armoury of biochemical barriers that can stop infection. These are:  

* '''Lactic and fatty acids''' in sweat and sebaceous secretions are directly bacteriocidal

* '''Lactic and fatty acids''' in sweat and sebaceous secretions are directly bacteriocidal

* '''Enzymes''' e.g. lysozyme in saliva, sweat & tears and Gastric acid denature microorganisms

* '''Enzymes''' e.g. lysozyme in saliva, sweat & tears and Gastric acid denature microorganisms