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Body Defence System
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Body Defence System
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Pathogens enter the body through
Respiratory system, digestive system, excretory system and skin
First line of defence
Skin and mucous membrane
Second line defence
Phagocytosis
Third line of defence
Body immune system
Body defence mechanism by skin
Secreted sweat and sebum that contains chemicals that can kill microorganisms
Body defence mechanism by mucous membrane
Nasal hairs filter microorganisms that enter respiratory tract by trapping it with mucous lining the nasal cavity
Phagocytosis
White blood cells engulf and digest the pathogens using enzymes
Antibody
Protein produced by white blood cells into the bloodstream in response to antigens
Immunisation
An effort to stimulate the body defence against infections in babies, children and adults by injecting vaccines
Classification of immunity
Passive immunity and active immunity
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