Term
Diffusion
(through a cell membrane)
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Definition
| the movement of small, lipid-soluble molecules directly through the phospholipid bilayer from an area of high solute concentration to an area of low solute concentration (down a concentration gradient) |
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Term
Osmosis
(through a cell membrane) |
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Definition
| The movement of water through protein-lined pores called aquaporins to an area of high solute concentraion |
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Term
| What moves through cell membranes by way of Diffusion? |
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Definition
- lipid-soluble substances such as:
alcohol,
glycerol
or fatty acids
- small gas molecules like O2 or CO2
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Term
| What moves by way of Osmosis? |
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Definition
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Term
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Definition
| The movement of non lipid-soluble, small molecules across a cell membrane using a carrier protein from an area of high concentration to an area of low concentration (down a concentration gradient) |
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