Immune System
By Olivia and Maryam
Immune System
Endocrine System
Lymphatic System
Cells
Other Defences
Problems
Other Defences
Skin
prevent bacteria and foreign substances from entering body
have anti-bacterial chemicals that prevent infections
Mucous Membrane
line mouth, throat, lungs, bowel
act as barrier similar to skin
Stomach Acid
kills most germs in stomach