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IGCSE Biology - Movement in and out of cells
Flash Cards about Movement in and out of cells
4
Biology
9th Grade
05/13/2010

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Term
Diffusion
Definition
As molecules naturally move across a membrane due to there being a higher concentration of that molecule on one side than of the other (down a concentration gradient)
Term
Active Transport
Definition
Movement of ions in and out of cells through the membrane from a region of lower concentration to a region of higher concentration. This requires energy released during respiration.
Term
Osmosis
Definition
Diffusion of water molecules from a region of higher concentration to a region of lower concentration.
Term
Concentration gradient/Potential Gradient
Definition
A gradient on which there is a larger concentration of one side of something than on the other. This plays a key role in Diffusion and Osmosis.
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