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Transcript 
The human body within
The immune system
Gabriele
Any substance capable of producing an immune response is
known as an antigen.
The immune system
Three lines of defence
Skin and mucous
membranes
Phagocytosis
antibodies
Phagocytes
B-lymphocytes
Monocytes
T-lymphocytes
(cytotoxic, helper,
suppressor)
Macrophages
Neutrophils
The cells of the immune system
Antibodies are secreted by lymphocytes B and they can match and
counteract any antigen.
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