Defence Mechanisms (AQA A-Level Biology): Flashcards
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Pathogen
Pathogen
Disease-causing organism
Immunity
Immunity
State where defense mechanisms are better prepared for the same pathogen
Non-specific defences characteristics
Non-specific defences characteristics
Immediate protection, respond identically to all pathogens
Specific defences characteristics
Specific defences characteristics
Develop slowly, target particular pathogens with precision
T lymphocytes role
T lymphocytes role
Cell-mediated responses
B lymphocytes role
B lymphocytes role
Humoral responses
Why body must distinguish self from non-self
Why body must distinguish self from non-self
To prevent lymphocytes attacking body's own tissues
Surface proteins function
Surface proteins function
Molecular identification tags on cells
Number of different lymphocyte types produced
Number of different lymphocyte types produced
Approximately ten million
Clonal selection
Clonal selection
Rapid division of lymphocytes when pathogen detected