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cell membranes and crossing the membrane

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Term
Definition
phospholipid   forms bilayer of cell membrane with nonpolar tails sandwiched in the middle  
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transport protein   membrane protein that lets polar, charged or large materials in or out of the cell  
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receptor protein   membrane protein that binds to a signal molecule  
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diffusion   movement from areas of higher to areas of lower until equilibrium  
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equilibrium   even distribution or balance so no net change occurs  
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solute   material dissolved in a solvent  
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solvent   liquid that dissolves solutes  
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facilitated diffusion   movement across a cell membrane down the gradient through a transport protein  
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passive transport   any movement across a cell membrane down the gradient without additional energy  
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active transport   movement against the gradient from lower areas to higher areas using energy  
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protein pump   transport protein that forces materials across the membrane against their gradient  
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exocytosis   when vesicle fuses with cell membrane to transport larger stuff OUT  
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endocytosis   when vesicle forms from cell membrane to transport larger stuff IN  
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permeable   allowed to pass across a membrane  
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selectively permeable   lets some stuff across a membrane but blocks other stuff  
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osmosis   facilitated diffusion of water down its gradient across a membrane  
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