Pathogen : disease
causing organism
Innate immune response
-earns' -
Viruses
=>
Physical Barriers (Keep pathogens out =>
Phagocytosis Adaptive immune response -
Bacteria
-
Skin
-
Engulfing & digesting of pathogens by
-
Fungi
~
Protozoa
B-cells
-
T cells
HCl phagocytes
-
-
in Stomach
~ lymphocytes
-
mucus lining airwayss...
Phagocytosis
⑱
:
⑳
hagosome
phagocyte pathogen O o
some enzymes
E
Phagocyte binds to the viral parasite The cell membrane wraps around the Lysosomes fuse wh the
phagosome releasing
· ·
·
,
via
complementary cell surface receptors
pathogen engulfing
,
it digestive enzymes
onto the
pathogen
The pathogen into vacuole The
feeding pathogen digested
·
is is
·
a
called a phagosome
·
-
Phagocytes present foreign antigens to
T helper cells . This activates them.
In addition to & ↳ Causes
engulfing digesting pathogens phagocytes become
antigen presenting them to Secrete
signalling molecules
-
,
-
they present digested foreign antigens using specialised cell membrane proteins called cytokines