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 TransportActive 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 DiffusionWhen 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.

Small molecules use protein pumps

Larger molecules are transferred by endocytosis

and exocytosis

Forms a pocket around the material and then breaks free inside the cell

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=DuDmvlbpjHQ

Exocytosis by parameciumhttp://

www.youtube.com/watch?v=U9pvm_4-bHg Endocytosis by amoeba

http://www.youtube.com/watch?v=W6rnhiMxtKU&list=PL_JrQv0cdUS_Pn4zUe2THWfMS1YHxyxL8