diffusion and osmosis. passive transport passive transport- movement of molecules across a cell...
DESCRIPTION
Diffusion Diffusion: movement of molecules from areas of high concentration to areas of low concentration Concentration: number of molecules of a substance in a given volume Concentration gradient: difference of concentration of a substance from one location to anotherTRANSCRIPT
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Diffusion and Osmosis
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Passive TransportPassive transport- movement of molecules
across a cell membrane without energy inputRefresh:
SoluteObject being dissolved
SolventObject doing the dissolving
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DiffusionDiffusion: movement of molecules from areas of
high concentration to areas of low concentrationConcentration: number of molecules of a
substance in a given volumeConcentration gradient: difference of
concentration of a substance from one location to another
![Page 4: Diffusion and Osmosis. Passive Transport Passive transport- movement of molecules across a cell membrane without energy input Refresh: Solute Object being](https://reader033.vdocuments.mx/reader033/viewer/2022051123/5a4d1b0a7f8b9ab05998a0a7/html5/thumbnails/4.jpg)
OsmosisOsmosis: Diffusion of water
Water moves across a semipermeable membrane from an area of high water concentration to an area of low water concentration
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Types of SolutionsIsotonic: cell has same concentration of
dissolved particles as cellWater moves into and out of cell at equal rates
and cell size remains constant
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Types of Solutions Cont.Hypertonic: Solution has a higher concentration
of dissolved particles than a cellWater concentration is higher in cell than outside
Water flows out of cell, cell shrivels
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Types of Solutions Cont.Hypotonic: solution has lower concentration of
dissolved particles than a cellWater concentration is higher outside cell than
inside cellWater flows into the cell, cell swells
Cell may burst, this is called lysed
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Plant CellsPlant cells prefer a hypotonic solution
Cell wall provides more support and are less likely to lyse
Plant cells at isotonic solutions are flaccidPlant cells at hypertonic solutions under-go plasmolysis
The cytoplasm and plasma membrane begin to pull away from the cell wall
Plant cell swells to point where it exerts a backward pressure, called turgor pressure This pressure prevents further uptake of water
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