Term
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Definition
| Movement of molecules from areas of high concentration to areas of low concentration. |
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Term
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Definition
| Specialized type of diffusion, where water moves from and area of high water content (low solute) to an area of lower water content (higher solute). |
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Term
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Definition
| The solution of one side of the membrane contains a greater concentration of solute compare to the other. |
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Term
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Definition
| The solution on one side of the membrane contains a lower concentration of solute compared to the other. |
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Term
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Definition
| Same solute/water concentration inside and outside of the cell. |
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Term
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Definition
| Allows some substances to pass through while restricting others. |
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Term
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Definition
| Substances can cross the membrane without any energy input form the cell. |
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Term
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Definition
| Cell provides metabolic energy (ATP) to move substances across the membrane. |
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Term
| Factors that Affect Diffusion Rates through a Selectively Permeable Membrane. |
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Definition
1) Greater difference inside/outside of cell, faster diffusion.
2) Size of substance. Smaller substance/faster diffusion.
3) Temperature. Higher temperature/faster molecules move.
4) Water or lipid soluble. Lipid soluble substance move through faster/cell membrane made of phospholipids. |
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Term
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Definition
| Non-polar and lipid-soluble substances diffuse directly through the lipid bilayer. |
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Term
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Definition
| Substances move passively through the membrane by binding to a protein or moving through protein channels. |
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Term
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Definition
| Water-specific channels where single file water molecules diffuse through the cell membrane. |
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