Summary
Summary AQA ALEVEL BIOLOGY NOTES CELL MEDIATED RESPONSE
- Module
- Unit 2 - Cells
- Institution
- AQA
ALEVEL NOTES ON THE IMMUNITY TOPIC- CELL MEDIATED REPONSE ADJUSTED TO THE AQA SPECIFICATION AND MADE FROM MARKSCHEMES
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Cell-mediated Response=
Basics
Immunity
, IH4N a"
what ?
are
antigens
•
An antigen is
part of substance that is
recognised self lforeign)
any an
organism or as non -
by the immune and stimulates immune
system an
response .
'
Antigens are
usually proteins that are part of the cell -
surface membranes or cell walls of invading
cells such such
,
as
microorganisms ,
or abnormal body cells ,
as cancer cells .
Cell-mediated immunity involved T
lymphocytes
-
called
T
lymphocytes so because they mature in the
thymus gland
'
are .
-
Cell-mediated immunity is
immunity involving body cells .
Cell -
mediated Immunity
1-
%
,"
have different cell surface membrane from the
Foreign cells
antigens their antigens on the
'
on
-
's cells
organism own .
What are
antigen -
presenting cells ?
surface
Antigen presenting cells are cells that
display foreign antigens their
'
-
on .
'
These cells can present antigens of other cells on their own cell -
surface membrane .
cells
Antigen presenting -
Phagocytes that have
engulfed and
hydrolysed pathogen present of
pathogen 's
•
a some a
antigens
on their own cell -
surface membrane
cells invaded of their surface
Body by a virus present some the viral
antigens own cell
. -
on
membrane .
from have different their
-
Transplanted cells individuals of the same species antigens on
cell surface -
membrane .
different from
Cancer cells are normal
body cells and present antigens their
-
on
cell -
surface membranes .
Neutrophils lthagooyte )
•
Account for around 60% of the white blood cells .
Part of of terms
cells
granulocytes
✓
a
group .
( have
Polymorphs lobed
•
. nuclear a nucleus)
They have short lifespan and travel the blood
•
a in .
Macrophages cphagocyte )
•
Tend to live inside tissues .
•
when
they ingest a
phathogen ,
they will begin
to display the
pathogens antigens on their surface
'' "
membrane the respond This Presentation
-
this stimulates
lymphocytes to
.
process is called
Antigen .
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