AQA Biology 6.1 defence mechanisms

Question	Answer
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

Resource summary

	Created by Charlotte Hewson almost 9 years ago