Pages in this set

Page 1

Preview of page 1
Keeping Healthy ­ Biology Core science


Defending against infection


Pathogens: bacteria

Bact
eri
a and
vir
uses
are
the
mai
n t
ypes
of
pat
hogen.
Bact
eri
a ar
e mi
croscopi
c
or
ganis
ms .


Bacter
ia
are
li
vi
ng cel
ls
and,
in
favour
able…

Page 2

Preview of page 2
White blood cells
Whi
te
blood
cel
ls
can:


I
ngest
pathogens and
dest
roy
them
Produce
anti
bodies
to
dest
roy
part
icul
ar
pathogens
Produce
anti
toxi
ns t
hat
count
eract
t
he t
oxins
rel
eased
by
pat
hogens.


Not
e t
hat
:

The
pathogens…

Page 3

Preview of page 3
Some
exampl
es
w oul
d be
aspi
ri
n,
par
acet
amol
and
ibupr
ofen.


Anti
biot
ics
can act
uall
y ki
l
l
or
prevent
t
he
growth
of
the
bacter
ia
causing
the
il
lness.
They
do
not
w or
k on
vi
ruses
be cause…

Page 4

Preview of page 4
A nti
biot
ics are su bst
a nc es
that
kil
l
bacter i
a or
stop t
he i
r growth.
T hey do
n ot w or
k against
vir
uses because
t hey
li
ve and r
e produc e i
nside
c el
ls.
I…

Comments

No comments have yet been made

Similar Biology resources:

See all Biology resources »See all resources »