AQA Biology 6.1 defence mechanisms

Pregunta	Respuesta
what are the two main types of defence of the human body?	non-specific and specific
what is a non-specific response?	doesn't distinguish between types of pathogens, responds to all in the same way
what are the two forms this can take?	-phagocytosis -barrier to the entry of pathogens
what is a specific response?	do distinguish between different pathogens. less rapid but provide long-lasting immunity
what type of blood cell does this use?	white blood cell called lymphocyte
what are the two forms this can take?	- cell-mediated responses involving T lymphocytes - humoral responses involving B lymphocytes
what would happen if lymphocytes couldn't distinguish between self and non-self material?	it would destroy the organisms own tissue
why is there a time lag between exposure to pathogen and bodies defences bringing it under control?	the antibody already exists and has to reproduce enough numbers to be effective in destroying the pathogen

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	Creado por Charlotte Hewson hace más de 9 años