Memory lymphocytes (Edexcel GCSE Biology): Flashcards
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What is the role of memory cells?
What is the role of memory cells?
Long-term defence against specific pathogens
What do memory lymphocytes enable?
What do memory lymphocytes enable?
Quicker, more effective response to same pathogen
What is the speed of initial pathogen response?
What is the speed of initial pathogen response?
Slow - many B-lymphocytes needed to find right antibody
What happens during initial infection?
What happens during initial infection?
Person shows symptoms while body produces antibodies
What type of cell are lymphocytes?
What type of cell are lymphocytes?
White blood cells
What do lymphocytes produce?
What do lymphocytes produce?
Antibodies to fight infection
When do memory cells form?
When do memory cells form?
After initial infection is cleared
What happens when same pathogen re-enters body?
What happens when same pathogen re-enters body?
Memory lymphocytes already present, multiply rapidly
What is the speed of secondary immune response?
What is the speed of secondary immune response?
Faster and more effective than first response
What do memory lymphocytes do in secondary response?
What do memory lymphocytes do in secondary response?
Clone themselves and produce antibodies quickly
What happens to symptoms in secondary response?
What happens to symptoms in secondary response?
Often eliminated before symptoms appear
How long do memory lymphocytes remain?
How long do memory lymphocytes remain?
Long time after first exposure