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4 Cards in this Set
- Front
- Back
Functions of plasma membrane
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1. Provides a protective barrier against substances and forces outside the cell
2. Some of the membrane proteins act as receptors - Bind to specific molecules arriving from outside the cell - After binding, molecule can induce a change in the cellular activity 3. Controls which substances can enter and leave the cell. The membrane is a selectively permeable barrier |
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Simple diffusion
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- Small, uncharged molecules and fat-soluble molecules can pass freely through the lipid bilayer
- Osmosis: diffusion of water molecules |
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Facilitated diffusion
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- Moving down their concentration gradient
- Moving through a specific integral protein |
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Active transport
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- AGAINST concentration gradient using energy
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