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Human Biology - Cell Surface Membrane and Transport Across Cell Membranes
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- 1BIMOLECULAR (BILAYER)Phospholipid molecules stretched out to form 2 layers
- 2FLUID MOSAIC MODELComponents free to move fluidly, and proteins in the bilayer vary in shape, size and pattern and are arranged like a mosaic.
- 3PASSIVE TRANSPORTDoes not involve the use of metabolic transport
- 4DIFFUSIONMovement of molecules from a region of high concentration to a region of low concentration, until they are equally distributed (along a concentration gradient)
- 5ACTIVE TRANSPORTEnergy-requiring process in which molecules are moved across membranes against a concentration gradient
- 6SOLUTEAny substance that is dissolved in a solvent. SOlutes and solvents form a solution
- 7OSMOSISThe passage of water from a region of high water potential to a region of low water potential through a partially permeable membrane
- 8WATER POTENTIALThe tendency of water molecules to leave a system
Ψ = Ψs + Ψp
Water potential = solute potential + pressure potential - 9TURGIDThe cell vacuole is full of water and the cytoplasm is pushed against the cell wall
- 10HAEMOLYSISIf red blood cells are placed in distilled (pure) water, water enters by osmosis and they burst
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- A-Level Human Biology Unit 1 Fichas sobre Human Biology - Cell Surface Membrane and Transport Across Cell Membranes, creado por mcrfan354 el 11/04/2015.
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- mcrfan354
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