The body's first line of defence against pathogens, preventing them from entering the body
Parts of the non-specific defence system
Skin
Nose and mucus
Cilia in trachea and bronchi
Stomach acid
Skin
Protective layer covering the body
Outer layer of dead cells difficult for pathogens to penetrate
Produces sebum to kill bacteria
Can scab over when damaged
Nose and mucus
Contract pathogens before they enter the breathing system
Cilia in trachea and bronchi
Covered in mucus
Contract pathogens upwards towards the throat to be swallowed
Stomach acid
Kills pathogens before they can enter the digestive system further
Even with the nonspecific defense systems, pathogens can still get into the human body and cause serious disease, so the immune system also protects us
