Download Cell Membrane PPT

Structure of the Cell Membrane
Outside of cell
Proteins
Lipid
Bilayer
Transport
Protein
Animations
of membrane
Go to structure
Section:
Carbohydrate
chains
Phospholipids
Inside of cell
(cytoplasm)
Cell Boundaries/ Cell Membrane
Animal cell
Plant cell
Cell / Plasma
Membrane
Cell Wall –
provides
support &
protection,
usually made
of tough
fibers
1. The Cell Membrane


Complex barrier separating the cell from it's external
environment
– Holding cytoplasm within cells
– Regulating substances entering and exiting cells
– Recognizing other cells
– Provides protection and support
Is arranged in a double layer
called a Lipid Bilayer –
Made up of Phospholipids
(a phosphate group
& 2 fatty acids)
1. The Cell Membrane

"Selectively Permeable" membrane that regulates
(like a gate) what passes into and out of the cell
1. The Cell Membrane


Cell Membranes are FLUID
Lipids and Proteins of the Cell Membrane are
always in motion
1. The Cell Membrane

Membrane Proteins
– PROTEIN MOLECULES are EMBEDDED in
the Lipid Bilayer
– HELP to MOVE Material INTO and OUT of
the Cell
1. The Cell Membrane
–
Often have carbohydrates attached to them to
serve as I.D. badges that allow cells to recognize
each other
1. The Cell Membrane

Diffusion
– Movement of particles from an area of high
concentration to an area of low concentration
(no energy required) (put dye in water)

Osmosis
– Diffusion of water through a selectively
permeable membrane
1. The Cell Membrane

Facilitated Diffusion / Passive Transport
– Uses proteins to move molecules through a
cell membrane along the concentration
gradient (no energy required)
1. The Cell Membrane

Active Transport
– Uses proteins to move molecule against the
concentration gradient
– Requires energy
Exocytosis and Endocytosis


Exocytosis – process of a cell releasing materials
(exiting)
Endocytosis – process of cell taking materials in
(entering)
Exocytosis
Example of both:
Nerurotransmitter



Isotonic
– The concentration of solutes is the same inside and
outside the cell
– Water moves in and out
Hypertonic
– Solution has a higher solute concentration than the cell
– Water moves out
Hypotonic
– Solution has a lower solute concentration than the cell
– Water moves in
Cellular Transport Review Diagrams
Active Transport Examples
Diffusion/ Facilitated Diffusion
Osmosis
Cell Transport Concept Map
Name
Date
Cell transport involves the
exchange of molecules
through the
Against the
concentration gradient
(low to high)
Down the
concentration gradient
(high to low)
large molecules
transported by
requires
small molecules move
through
moved by
of water
in
out
Small molecules
move through
Larger molecules
move through
examples
Example:
Example:
also called
Word Bank:
Active Transport
Passive Transport
Diffusion
Facilitated Diffusion
ATP Energy
Glucose/Amino Acids/Ions
Wastes/Secretions
Cell Membrane (2X) Osmosis
Food/Bacteria
Proteins (2X)
Endocytosis
Exocytosis
Youtube

http://www.youtube.com/watch?v=HqKlLm2MjkI
Which cell process will move
substances against a concentration
gradient?
[NC08 EOC]
A
B
C
D
E
diffusion
facilitated diffusion
osmosis
passive transport
Requires ENERGY
active transport
Which diagram represents
active transport?
[TN09 EOC]