Notes on Tonicity
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| Diffusion | The movement of molecules of substances from an area of higher concentration to an area of lesser concentration to reach equilibrium
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| Passive transport or simple diffusion | The movement of molecules from an area of higher to lower concentration to reach equilibrium without expanderes of energy.
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| Facilitated diffusion | The transport of substances across a membrane by means of a carrier molecule
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| Active transport | When solute must pass through the cell membrane past its concentration gradient.
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| Osmosis | The movement of molecules of a solvent through a semi permeable membrane from an area of higher to lesser concentration to reach equilibrium
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| Concentration gradient | The direction of the movement of molecules of substances.
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| Tonicity | Movement of molecules of a substance is inside and out of the cell
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| Isotonic | When solvent can go inside and outside of the cell because there is an equal amount of solvent and solute outside and inside the cell
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| Hypertonic | When solvent can only go outside of the cell because there is a greater amount of solvent inside the cell. There is a smaller amount of solute outside of the cell. As a result the cell shrink
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| Hypotonic | When solvent only inside of the cell because there's a greater amount of solvent outside. There is a lesser amount of solute inside the cell. As a result the cell will swell.
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