Cell Membrane Plasma Membrane Phospholipid Bilayer Semipermeable Membrane Ch. 7 7.1-7.2.

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Presentation transcript:

Cell Membrane Plasma Membrane Phospholipid Bilayer Semipermeable Membrane Ch. 7 7.1-7.2

Function of the Cell Membrane MAINTAIN HOMEOSTASIS (Stable internal environment)

The Gatekeeper Selectively permeable – allows some substances to cross more easily than others Made mainly of lipids & proteins

Fluid Mosaic Model Membrane is a fluid structure with a “mosaic” of various proteins Lipids & some Proteins move laterally Some Proteins are held still by the cytoskeleton

Proteins determine function 1. Integral – many (not all) are transmembrane 2. Peripheral – not embedded in bilayer

What moves in and out of the Cell Membrane? Small molecules & ions move in & out at different rates. Some move easily, some need help from proteins

Transport Proteins Allow substances to pass avoiding contact with the lipid bilayer. Channel Proteins: act like a tunnel through the membrane. Pg. 131 Carrier Proteins: carry substances & change their shape to accommodate & pass through the membrane. Specific for the substances it moves

Carrier Protein Example Glucose has a specific carrier protein to help it move across the membrane. The protein rejects fructose b/c it is specific for Glucose only. (Ex. On pg. 131)

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