Slides in 3 lines of defence
The body’s first line of defence is its natural barriers which include:
- chemicals in tears
- chemicals in sweat
- stomach acid
Non-specific response inside the body to pathogens which have made it past the first line of defence.
- increased blood flow to the affected area
- white blood cells engulfing and digesting the pathogens
- formation of scabs to close the wound.
Specific response by the body to the pathogen.
These are known as antigens or antibodies. They can respond to the pathogen in a number of ways:
- bind to pathogens and damage or destroy them.
- coat pathogens, clumping them together so that they are easily ingested by phagocytes.
- bind to the pathogens and release chemical signals to attract more phagocytes ( atype of white blood cell)