Transcript Transport Notes

CELL MEMBRANE
WHAT IS THE CELL (PLASMA) MEMBRANE?

Lipid-bilayer around outside of cell’s cytoplasm
FUNCTION OF CELL MEMBRANE

Regulates what enters and leaves the cell.
 Selectively permeable
Protects and supports the cell.
 It is like the doors to this classroom, or to the
school.

CELL MEMBRANE STRUCTURE

Lipid bilayer
http://www.youtube.com/watch?v=LKN5sq5dtW4
LIKE A HERD OF MUSK OX!!!
MUSK OXEN IN ACTION

http://www.youtube.com/watch?v=o5I_3i6tIhI
&list=PLDA6622E7218A0A1A
Cell Transport
There are two Types of Cell transport:
Passive Transport
Active transport
Passive Transport
• Movement of materials across the cell membrane that
DOES NOT require energy
• Two Types: Osmosis & Diffusion
Diffusion
The process by which particles
move from an area of high
concentration to an area of low
concentration
Facilitated Diffusion
When molecules that cannot diffuse direclt actross the membrane and pass
through special protein channels
Osmosis
• The diffusion of water through the membrane.
• Water will move until equilibrium is reached
Active Transport
The movement of materials
from an area of low
concentration to an area of
high concentration. This
requires ENERGY.
Forms a pocket around the material and
then breaks free inside the cell
Small molecules use protein
pumps
Larger molecules are
transferred by endocytosis
and exocytosis
Membrane of vacuole surrounding material
fuses with the cell membrane
IN NOTEBOOK – 7.3
Tape in Cell Membrane Diagram
 Color the following types of transport:

 Ion
Channel = Red
 Simple Diffusion = Yellow
 Facilitated Diffusion = Green
 Osmosis = Blue
 Protein Pump = Purple
 Endocytosis = Orange
 Exocytosis = Orange
For each of these types of
transport:
1. Describe what types of
materials are moved
2. Give the definition of this
type of transport
3. Identify it is either active
(requires energy) or
passive (no energy
needed) transport.
ENDOCYTOSIS AND EXOCYTOSIS (BULK
TRANSPORT)
http://www.youtube.com/watch?v=DuDmvlbpj
HQ
 Exocytosis by paramecium
http://www.youtube.com/watch?v=U9pvm_
4-bHg
 Endocytosis by amoeba

 http://www.youtube.com/watch?v=W6rnhiMxtKU&l
ist=PL_JrQv0cdUS_Pn4zUe2THWfMS1YHxyxL8