Give a brief description of the biological functions of the complement system:

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involved in type II (cytotoxic) and type III (immune complex) hypersensitivity reactions

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activates cellular immune responses

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stimulates the production of protective antibodies

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ensures the release of inflammatory mediators (histamine, heparin, etc.) into the tissue

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activates fibrinolysis

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triggers the apoptosis process

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plays an important role in the opsonization of pathogenic bacteria

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