10
Proteins
are
found
floating
in
the
This
layer
can
then
act like
aaround
‘tough’

An
These
important
proteins
part
have
of
membranes
many
very
is
the
lipid
The much
cell membrane
isathe
outside
layer
membrane.
Some
of
them
only
go
halffluid
like
that
of
nearly
CHOLESTEROL.
important functions:
It is of
keeps
the “heads &
(“skin”)
the
cell.
way
through
the
membrane,
others stick
unpoppable
soap
bubble.
The
tails”
from
being
tangled
together.
 One type
of
proteins
act White
as “SIGN
This
is
important
for
cells
like
your
Blood
the
whole
way
through.
membrane
will
“flow”
around
the
cell.
 It is made
from
a combination
of of your
H
OLDERS
”
that
tell
other
parts
Cells, which are supposed to go around and kill
Lipids
&
Proteins.
ofexample
cell it is. is
things thatbody
don’texactly
belong.what
Onekind
great
yourform
Redtwo
blood
cells.
 The lipids
“back-to-back”
layers known as a LIPID BILAYER.
11
A doctor
can
give Type
O blood
todoesn’t
anyone,have
since any
it does
Type
O
blood
is
blood
that
So, if your blood is Type A your white blood cells
not have any signs,
there
is nothing
tolike:
make the WBCs
signs
on
it.
It
looks
There
are
FOUR
different
types
of
would
recognize
the
big
green
protein
sticking
out
mad,
they Type
won’t AB,
attack!
This isyou
whycould
hospitals
want
If yousowere
though,
receive
of it who
andare
leave
it O
alone.
However,
if for
some
blood:
people
Type
to
donate
blood
as
often
as
any type of blood because your WBC’s would
reason,
they
can. a doctor gave you Type B blood, you
recognize eitherA,
theB,
A-signs
or O
the B-signs, so
AB,
&
would be in trouble. Your WBC’s would not
they would not attack anything!
recognize
thetwo
purple
protein
and itawould
attack
There
are
different
“signs”
protein
in
What
do
you
think
an
AB
type
and destroy
the blood
cell. This can
would
end up
a red blood
cell membrane
hold:
blood
cellblood
would
look
clogging
up your
stream
withlike?
dead cells
and you would die.
3
Analogy:
This is like
line on”a

Other proteins
canthe
actoffensive
as “DOORWAYS
football team.
The
line wants to
to get materials
into the
cell.
keep the defensive players from
A cell getting
membrane
is SEMI
-PERMEABLE
through
at all
costs, but . In
Latin,
“Permeable”
pass
they
WANT the means
running“to
back
to get
through”.
something
is semi- to
through soIf he
can run forward
permeable,
get yards.it allows some objects
through, but keeps others out. Oxygen
(O2), Carbon Dioxide (CO2), & Water
(H20) can pass through a membrane any
time they wish.