lipid-bilayer around outside of cell’s cytoplasm
TRANSCRIPT
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CELL MEMBRANE
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WHAT IS THE CELL (PLASMA) MEMBRANE?
Lipid-bilayer around outside of cell’s cytoplasm
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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.
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CELL MEMBRANE STRUCTURE
Lipid bilayer http://www.youtube.com/watch?v=LKN5sq5dtW4
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LIKE A HERD OF MUSK OX!!!
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MUSK OXEN IN ACTION
http://www.youtube.com/watch?v=o5I_3i6tIhI&list=PLDA6622E7218A0A1A
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Cell Transport
There are two Types of Cell transport:
Passive TransportActive transport
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Passive Transport
• Movement of materials across the cell membrane that DOES NOT require energy
• Two Types: Osmosis & Diffusion
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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
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Osmosis• The diffusion of water through the membrane. • Water will move until equilibrium is reached
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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
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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.
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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