Compléter
Students will walk through terms related to the immune system and how it is triggered and operates.
James
was
hiking
through
the
forest
when
he
scraped
his
knee
on
a
sharp
rock
.
Almost
instantly
,
his
body
?
s
activated
to
fight
off
any
harmful
invaders
.
His
skin
and
mucous
membranes
served
as
,
while
enzymes
like
in
his
tears
helped
break
down
bacterial
cell
walls
.
All
mammalian
cells
have
-
(
)
that
bind
to
molecules
found
on
pathogen
cell
walls
,
allowing
them
to
correctly
identify
friend
from
foe
.
Soon
,
redness
and
swelling
appeared
at
the
wound
site
due
to
the
a
process
that
increases
blood
flow
and
allows
immune
cells
to
reach
the
injured
area
.
At
the
injury
site
,
,
the
most
abundant
white
blood
cells
,
arrived
first
and
began
engulfing
bacteria
through
,
a
process
in
which
cells
ingest
harmful
microbes
.
Meanwhile
,
,
a
type
of
white
blood
cell
that
resides
in
tissues
,
released
,
a
chemical
that
triggered
more
inflammation
.
As
the
immune
response
continued
,
another
type
of
white
blood
cell
,
targeted
larger
parasitic
invaders
,
while
,
large
phagocytic
cells
,
arrived
to
clean
up
debris
and
dead
pathogens
.
Throughout
the
body
,
(
)
circulate
and
detect
abnormal
membrane
proteins
and
release
chemicals
that
cause
,
a
programmed
cell
death
or
suicide
.
If
James
were
to
encounter
a
viral
infection
upon
scraping
his
knee
,
are
chemicals
that
infected
cells
release
that
trigger
healthy
,
nearby
cells
to
respond
by
secreting
substances
that
prevent
infected
cells
from
replicating
.
This
series
of
events
also
triggers
the
,
made
up
of
around
30
proteins
found
in
the
blood
that
leads
to
the
lysis
(
bursting
)
of
invading
cells
.
As
the
infection
persisted
,
James
?
s
,
a
specialized
network
of
cells
and
proteins
,
began
a
more
targeted
attack
.
His
,
a
type
of
white
blood
cell
,
recognized
specific
invaders
and
helped
mount
a
defense
.
These
cells
are
made
up
of
specialized
T
cells
,
and
B
cells
.
The
response
began
when
a
captured
fragments
of
the
invading
pathogen
(
called
an
,
or
name
tag
,
usually
containing
pathogenic
proteins
)
and
displayed
them
on
its
surface
to
alert
other
immune
cells
.
Only
one
specific
part
of
the
name
tag
is
used
to
bind
to
antigen
receptors
that
trigger
an
immune
response
;
this
part
is
known
as
an
.
are
adaptive
immune
cells
that
produce
,
proteins
that
specifically
bind
to
and
neutralize
pathogens
.
B
cells
bind
to
epitopes
floating
in
body
fluids
or
attached
to
pathogens
,
while
only
bind
to
fragments
presented
by
the
host
cell
on
their
own
membrane
.
The
special
protein
complex
that
holds
the
antigen
fragment
(
epitope
)
on
the
host
cell's
plasma
membrane
is
called
the
.
read
these
molecules
and
trigger
different
responses
based
off
of
the
type
of
T
cell
they
are
.
Helper
are
regulatory
immune
cells
that
release
,
signaling
proteins
,
that
activate
other
cells
for
the
adaptive
immune
response
and
acts
as
a
to
prevent
overreaction
of
adaptive
response
.
specialize
in
recognizing
and
killing
infected
cells
via
apoptosis
and
memory
.
allows
the
immune
system
to
respond
faster
if
exposed
to
pathogen
again
.
All
mature
in
an
organ
called
the
,
found
in
the
chest
of
babies
.
Initially
,
James
?
s
immune
system
was
experiencing
a
,
the
initial
immune
response
to
a
pathogen
.
If
he
encountered
the
same
pathogen
again
,
his
would
generate
a
,
a
faster
and
stronger
reaction
.
B
cells
are
related
to
the
,
which
uses
antibodies
and
phagocytosis
to
attack
pathogens
,
while
cytotoxic
T
cells
specifically
are
related
to
the
-
,
which
triggers
the
destruction
of
infected
cells
.
Not
all
immunity
is
developed
through
infection
.
James
had
received
a
as
a
child
,
which
exposed
him
to
harmless
forms
of
pathogens
and
triggered
providing
long
-
term
protection
.
His
younger
sister
,
however
,
received
antibodies
from
their
mother
?
s
milk
,
an
example
of
,
which
provided
temporary
protection
from
another
individual
.
|
Creed Paragraph #2
Complete the lyrics of the song with the words that appear on the right side