vaccines Flashcards
1
Q
what is the immune system composed of?
(2 marks)
A
innate immunity
acquired immunity
2
Q
what is innate immunity?
(4 marks)
A
- does not depend on previous exposure to antigens
- not specific - defend against everything
- creates no memory
- cannot alter the size of response to an antigen
3
Q
examples of innate immunity?
(3 marks)
A
- physcial barriers (skin/mucosa)
- secretions (mucus/stomach acid)
- non-specific cellular response
4
Q
what is acquired immunity?
(4 marks)
A
- specific - recognises non-self in highly specified manner
- memory - immunity acquired following exposure
- involves specific group of WBCs (lymphocytes) and antibodies they create
- ability to amplify response - make more antibodies - increases number of WBCs in response
