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Cell Membrane
Cell Membrane?
Location?
 _______________ the cell
Function?
1. _______________ and
__________ for the cell
2. Regulation of what ________ and
_________ the cell
WHY?
-Essential in order to maintain
*homeostasis within the cell
*maintaining _________ internal
conditions
Composition of Cell Membrane
 Phospholipid Bilayer
1.
_______________:


Hydrophilic Head; “water-_________”
Hydrophobic Tail; “water-_________”
2. Bilayer

_______-layers (of phospholipids)
Composition of Cell Membrane
 ___________ embedded
throughout phospholipid
bilayer
 Integral Proteins: ______
the width of the cell
membrane
 ___________ Proteins:
Located on one side of the
cell membrane (or on the
‘periphery’)
 A variety of different
________ of proteins within
the cell membrane, each
with different ___________
Composition
 ______________: another lipid
that maintains the _____________
stability of the cell membrane
 Carbohydrates: allow for cell-tocell ______________; a
“fingerprint” for each cell
 Allows for the immune system
to recognize ‘foreign’ cells and
attack them
 Attached to proteins or
phospholipids on __________
layer of cell membrane
Fluid Mosaic Model
 Break it down:
 FLUID: The cell membrane is ___________
________ due to the lipid “tails” on its interior;
they “wiggle”
 This means that the cell membrane is pliable
 The cell membrane has the consistency of olive oil
at body temp.
 MOSAIC: __________________ of different types,
________________ positioned throughout the
membrane create a “mosaic” appearance
The cell membrane is a constantly moving
assemblage of parts.
Cell Membrane Function
 Transport of molecules from one side of the membrane to the
other in order to maintain homeostasis within the cell.
 _____________ Permeable: Only _________ substances can
move across the membrane while others cannot.
 _________, non-charged molecules (H20, CO2, O2, etc.) can
________ cross the cell membrane.
 This is referred to as Passive Transport: molecules are ‘freely’ or
‘passively’ traveling through the cell membrane
 This occurs through one of two ways: ___________ or ____________
diffusion
Passive Transport: Diffusion
 No ____________ is required
 Diffusion: the movement of
molecules from a __________
concentration to a _________
concentration until equilibrium
is reached
 Concentration: the amount of
solute in the solvent
 ___________: dissolved
substance (in the solvent)
 solvent: the liquid containing
the dissolved substance
 Equilibrium: occurs when the
__________ concentration is
the same throughout the
system; ___________ on both
sides of the membrane
Passive Transport: Facilitated Diffusion
 A form of Passive Transport (so no _________
required)
 Facilitated Diffusion: ____________ molecules (that
are unable to passively cross the cell membrane) are
“carried” through via a channel protein.
 Specific protein channels carry specific types of
molecules
 For example: __________ is transported across the cell
membrane via facilitated diffusion