the immune system
They make you bleed to your death so you can't get pathogens.
sebaceous glands
they help to defend the body against diseases
they help to defend the body against diseases
Because our bodies have evolved to defend ourselves from these pathogens. We have an "immune system".
white blood cells
Antitoxins
Sickle Cell Disease, Acquired Immune Deficiency Syndrome (AIDs), Gonorrhoea and Haemophilia are some diseases that the body cannot defend itself against. :D
The main function of white blood cells (also commonly referred to as leucocytes) is to defend against foreign invading pathogens that may enter the body. They do this as they are phagocytes, in that they engulf pathogens and destroy them. Therefore, the function of a white blood cell is to defend the body against infection.
by eating wrong!
Washing your hands and face is a defensive reaction. it help defend your body against infection by pathogens.
1) Physical barrier. 2) "Normal bacteria" will resist new-comers.