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The immune system works in three ways: external, passive non-specific response: natural flora (eg- bacterium on skin), secretions (eg- mucus which prevents harmful bacteria contacting cell wall), surface barriers (eg-skin) internal, active non-specific response: White blood cells such as phagocytes and macrophages, complement proteins and interferons internal, active specific response: B lymphocytes, T lymphocytes

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16y ago

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