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13 Cards in this Set
- Front
- Back
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the outer boundary of cells
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plasma membrane
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made up of 2 layers of molecules called teh phospholipids
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lipid bilayer
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random movement of ions and other particles
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diffusion
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greater concentration to less
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dynamic equilibrum
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no energy required
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passive transport
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diffusion of water in and out of cells across a selectively permeable membrane
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osmosis
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use of transport proteins to aid the passage of particles across the plasma membrane
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facilitated difusion
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provides water-filled passages through which small dissolved particles like ions can diffuse
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channel proteins
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change shape to allow certain molecules to cross the plasma membrane
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carrier protein
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open to allow plassage of particles, when a "signal" molecule combines with the gate. when the signal molecule is released, the gate closes.
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gate protein
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lesser concentration to greater concentration
energy required |
active transport
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process whic the plama membrane engulfs and takes in substances from a cell's environment
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endocytosis
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takes out substances from a cell's environment
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exocytosis
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