logging in or signing up 05CellMembranes kcercone Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINT lite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: (To copy code, click on the text box) Embed: URL: Thumbnail: WordPress Embed Customize Embed The presentation is successfully added In Your Favorites. Views: 8 Category: Education License: All Rights Reserved Like it (0) Dislike it (0) Added: September 23, 2011 This Presentation is Public Favorites: 0 Presentation Description No description available. Comments Posting comment... Premium member Presentation Transcript Cell Membranes & Movement Across Them : 2006-2007 Cell Membranes & Movement Across ThemCell (plasma) membrane: Cell (plasma) membrane Cells need an inside & an outside… separate cell from its environment cell membrane is the boundary IN food - sugars - proteins - fats salts O 2 H 2 O OUT waste - ammonia - salts - CO 2 - H 2 O products - proteins cell needs materials in & products or waste outBuilding a membrane: Building a membrane How do you build a barrier that keeps the watery contents of the cell separate from the watery environment? What substance do you know that doesn ’ t mix with water? FATS LIPIDS Remember: oil & water don ’ t mix!!Lipids of cell membrane: Lipids of cell membrane Membrane is made of special kind of lipid phospholipids “ split personality ” Membrane is a double layer phospholipid bilayer inside cell outside cell lipid “ repelled by water ” “ attracted to water ” phosphateSemi-permeable membrane: Semi-permeable membrane Cell membrane controls what gets in or out Need to allow some materials — but not all — to pass through the membrane semi-permeable only some material can get in or out aa H 2 O sugar lipids salt waste So what needs to get across the membrane? O 2Crossing the cell membrane: Crossing the cell membrane What molecules can get through the cell membrane directly? fats and oils can pass directly through inside cell outside cell lipid salt aa H 2 O sugar waste but… what about other stuff?Cell membrane channels: Cell membrane channels Need to make “ doors ” through membrane protein channels allow substances in & out specific channels allow specific material in & out H 2 O channel, salt channel, sugar channel, etc. inside cell outside cell sugar aa H 2 O salt wasteHow do you build a semi-permeable cell membrane?: How do you build a semi-permeable cell membrane? Channels are made of proteins proteins both “ like ” water & “ like ” lipids bi-lipid membrane protein channels in bi-lipid membraneProtein channels: Protein channels Proteins act as doors in the membrane channels to move specific molecules through cell membrane HIGH LOWMovement through the channel: Movement through the channel Why do molecules move through membrane if you give them a channel? ? ? HIGH LOWMolecules move from high to low: Molecules move from high to low Diffusion move from HIGH to LOW concentrationDiffusion: Diffusion Move from HIGH to LOW concentration passive transport no energy needed diffusion osmosis diffusion of waterSimple Diffusion : Simple Diffusion Move from HIGH to LOW inside cell outside cell Which way will fat move? fat fat fat fat fat fat fat fat fat fat fat fat fat fat LOW HIGHFacilitated Diffusion: Facilitated Diffusion Move from HIGH to LOW through a channel inside cell outside cell sugar sugar sugar sugar sugar sugar sugar sugar sugar sugar sugar Which way will sugar move? sugar sugar LOW HIGHDiffusion: Diffusion Move from HIGH to LOW concentration directly through membrane simple diffusion no energy needed help through a protein channel facilitated diffusion (with help) no energy needed HIGH LOWSimple vs. facilitated diffusion: Simple vs. facilitated diffusion inside cell outside cell lipid inside cell outside cell H 2 O simple diffusion facilitated diffusion H 2 O protein channelActive transport: Active transport Cells may need molecules to move against concentration “ hill ” need to pump “ uphill ” from LOW to HIGH using energy protein pump requires energy ATP ATPTransport summary: Transport summary simple diffusion facilitated diffusion active transport ATPOsmosis Movement of Water Across Cell Membrane : 2006-2007 Osmosis Movement of Water Across Cell MembraneOsmosis: Osmosis Water is very important, so we talk about water separately Osmosis diffusion of water from HIGH concentration of water to LOW concentration of water across a semi-permeable membraneIce Fishing in Barrow: Ice Fishing in Barrow You do not have the permission to view this presentation. In order to view it, please contact the author of the presentation.
05CellMembranes kcercone Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINT lite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: (To copy code, click on the text box) Embed: URL: Thumbnail: WordPress Embed Customize Embed The presentation is successfully added In Your Favorites. Views: 8 Category: Education License: All Rights Reserved Like it (0) Dislike it (0) Added: September 23, 2011 This Presentation is Public Favorites: 0 Presentation Description No description available. Comments Posting comment... Premium member Presentation Transcript Cell Membranes & Movement Across Them : 2006-2007 Cell Membranes & Movement Across ThemCell (plasma) membrane: Cell (plasma) membrane Cells need an inside & an outside… separate cell from its environment cell membrane is the boundary IN food - sugars - proteins - fats salts O 2 H 2 O OUT waste - ammonia - salts - CO 2 - H 2 O products - proteins cell needs materials in & products or waste outBuilding a membrane: Building a membrane How do you build a barrier that keeps the watery contents of the cell separate from the watery environment? What substance do you know that doesn ’ t mix with water? FATS LIPIDS Remember: oil & water don ’ t mix!!Lipids of cell membrane: Lipids of cell membrane Membrane is made of special kind of lipid phospholipids “ split personality ” Membrane is a double layer phospholipid bilayer inside cell outside cell lipid “ repelled by water ” “ attracted to water ” phosphateSemi-permeable membrane: Semi-permeable membrane Cell membrane controls what gets in or out Need to allow some materials — but not all — to pass through the membrane semi-permeable only some material can get in or out aa H 2 O sugar lipids salt waste So what needs to get across the membrane? O 2Crossing the cell membrane: Crossing the cell membrane What molecules can get through the cell membrane directly? fats and oils can pass directly through inside cell outside cell lipid salt aa H 2 O sugar waste but… what about other stuff?Cell membrane channels: Cell membrane channels Need to make “ doors ” through membrane protein channels allow substances in & out specific channels allow specific material in & out H 2 O channel, salt channel, sugar channel, etc. inside cell outside cell sugar aa H 2 O salt wasteHow do you build a semi-permeable cell membrane?: How do you build a semi-permeable cell membrane? Channels are made of proteins proteins both “ like ” water & “ like ” lipids bi-lipid membrane protein channels in bi-lipid membraneProtein channels: Protein channels Proteins act as doors in the membrane channels to move specific molecules through cell membrane HIGH LOWMovement through the channel: Movement through the channel Why do molecules move through membrane if you give them a channel? ? ? HIGH LOWMolecules move from high to low: Molecules move from high to low Diffusion move from HIGH to LOW concentrationDiffusion: Diffusion Move from HIGH to LOW concentration passive transport no energy needed diffusion osmosis diffusion of waterSimple Diffusion : Simple Diffusion Move from HIGH to LOW inside cell outside cell Which way will fat move? fat fat fat fat fat fat fat fat fat fat fat fat fat fat LOW HIGHFacilitated Diffusion: Facilitated Diffusion Move from HIGH to LOW through a channel inside cell outside cell sugar sugar sugar sugar sugar sugar sugar sugar sugar sugar sugar Which way will sugar move? sugar sugar LOW HIGHDiffusion: Diffusion Move from HIGH to LOW concentration directly through membrane simple diffusion no energy needed help through a protein channel facilitated diffusion (with help) no energy needed HIGH LOWSimple vs. facilitated diffusion: Simple vs. facilitated diffusion inside cell outside cell lipid inside cell outside cell H 2 O simple diffusion facilitated diffusion H 2 O protein channelActive transport: Active transport Cells may need molecules to move against concentration “ hill ” need to pump “ uphill ” from LOW to HIGH using energy protein pump requires energy ATP ATPTransport summary: Transport summary simple diffusion facilitated diffusion active transport ATPOsmosis Movement of Water Across Cell Membrane : 2006-2007 Osmosis Movement of Water Across Cell MembraneOsmosis: Osmosis Water is very important, so we talk about water separately Osmosis diffusion of water from HIGH concentration of water to LOW concentration of water across a semi-permeable membraneIce Fishing in Barrow: Ice Fishing in Barrow