C. Sheffer Thomas High School

1. Transport across the Cell Membrane C. Sheffer Thomas High School

2. Transport of Molecules Requires no energy Requires energy Passive transport Active transport Diffusion Osmosis The movement of molecules against a concentration gradient. Moving from low concentration to high concentration. Requires energy input. Movement of water across a membrane from high to low concentration Movement of molecules on a concentration gradient from high to low concentration Cells use ATP as the energy source for active transport. To cell membrane notes

3. map Osmosis Section 7-3

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6. Transport across a cell membrane The structure of the cell membrane ( a phospholipids bilayer) allows for both active and passive transport across the membrane Active transport Passive transport Osmosis Diffusion Facilitated Diffusion Sodium Potassium pump Bulk transport Movement of water across the Cell Membrane Small molecules such as CO2 diffuse across the membrane Larger molecules such as glucose are moved across the membrane by carrier proteins without using energy Moves ions against concentration using ATP for energy Endocytosis Into the cell Exocytosis Out of the cell END

7. Outside of cell Carbohydrate chains Proteins Cell membrane Inside of cell (cytoplasm) Protein channel Lipid bilayer The Structure of the Cell Membrane Section 7-3 To concept map

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11. Facilitated Diffusion Section 7-3 Glucose molecules High Concentration Cell Membrane Low Concentration Protein channel To concept map

12. Molecule to be carried Energy Molecule being carried Section 7-3 Active Transport To concept map