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Transcript
Cell Transportation How substances moves in and out of cells Review: Cell Membrane Function Protects the cell Takes in food/nutrients Gets rid of waste from inside cell Allows cells to communicate w/ other cells QuickTime™ and a decompressor are needed to see this picture. Cell Membrane Structure A semipermeable membrane Lipid molecules form a double layer protein molecules can move around inside layer QuickTime™ and a decompressor are needed to see this picture. The cell membrane in an animal cell: QuickTime™ and a TIFF (Uncompressed) decompressor are needed to see this picture. The cell membrane in a plant cell: QuickTime™ and a TIFF (Uncompressed) decompressor are needed to see this picture. Diffusion Movement of molecules across a membrane QuickTime™ and a decompressor are needed to see this picture. Molecules move from areas of high concentration to areas of low concentration high concentration=more molecules; low concentration=less molecules Diffusion in Cells Not all molecules can move across the cell membrane by diffusion QuickTime™ and a decompressor are needed to see this picture. Rules: 1.) equal # of molecules on both sides 2.) molecules move in or out of cell until there is an equal # on both sides of the cell membrane Osmosis Movement of water molecules across a membrane QuickTime™ and a decompressor are needed to see this picture. Like diffusion, molecules move from an area of high concentration to an area of low concentration. Osmosis in Cells Rules: 1.) H20 can pass across the cell membrane in both directions 2.) amount of H20 going in=same amount of H20 going out QuickTime™ and a decompressor are needed to see this picture. Three different types of environments for the cell membrane Isotonic Solution: The water concentration is the same as that of the cell. QuickTime™ and a TIFF (Uncompressed) decompressor are needed to see this picture. Three different types of environments for the cell membrane Hypertonic Solution: has a lower concentration of water compared to the cell. Water goes out of the cell, causing it to shrivel. QuickTime™ and a TIFF (Uncompressed) decompressor are needed to see this picture. Three different types of environments for the cell membrane Hypotonic Solution: has higher concentration of water as compared to that of a cell. The water pushes into the cell, causing the cell to swell-up. QuickTime™ and a TIFF (Uncompressed) decompressor are needed to see this picture. Three different types of environments for the cell membrane QuickTime™ and a decompressor are needed to see this picture. Blood Cells in different solutions QuickTime™ and a decompressor are needed to see this picture. QuickTime™ and a decompressor are needed to see this picture. Passive Transport Movement of molecules across a cell membrane Another way of saying ‘osmosis and diffusion’ Does not require energy Active Transport QuickTime™ and a decompressor are needed to see this picture. ATP=chemical energy used For pump! Process that allows molecules to move across the cell membrane from lower to high concentrations (opposite of diffusion!) Active transport requires energy in the form of proteins as they “pump” to move molecules across the cell membrane. Passive v. Active…let’s compare! QuickTime™ and a decompressor are needed to see this picture. Protein Channels Larger molecules (i.e. sugars) need help getting through membrane; transported through protein channels Does not require energy b/c the molecules are still moving from areas of higher concentration to areas of lower concentration. QuickTime™ and a decompressor are needed to see this picture.