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Transcript
THE CELL MEMBRANE AKA. THESE NOTES ARE A BIT LONGER BUT YOU HAVE A QUIZ NEXT WEEK AND I WANT YOU TO BE READY. Przeworski Functions of The Cell Membrane - Regulates what enters and exits the cell (homeostasis) - Gives a cell shape and support HOMEOSTASIS • The process of maintaining a stable internal environment • Example: Air Conditioning, Sweating The Phospholipid Bilayer - Cell membranes are made of phospholipids Fatty acid Fatty acid The Phospholipid Bilayer - Phospholipids have a hydrophilic head and a hydrophobic tail Water Fearing Water Loving The Phospholipid Bilayer - The membrane is selectively permeable: it allows only certain molecules to pass through - Some very small molecules can pass directly between the phospholipids - CO2 - O2 - H2O The Phospholipid Bilayer - Large or charged molecules must pass through transport proteins - 3 types: - Channel - Carrier - Pump Pump Channel Carrier The Fluid Mosaic Model - The lipid bilayer is described as a fluid mosaic: - Fluid – components of the two layers can move side to side freely - Mosaic – pattern created by scattered proteins embedded in lipid bilayer (chocolate chip cookie) Other Components - Glycoproteins (keys): help cells recognize other cells with attached carbohydrate chains Other Components - Cholesterol: found only in animal cell membranes, helps maintain fluidity VIDEO • https://www.youtube.com/watch?v=6fhbbFd4icY Solutes, Solvents, and Solutions Solute: Substance that dissolves in the solvent Solvent: Substance in which the solute dissolves Solution: Mixture of 2 or more substances More Simply… Solute + Solvent = Solution Solutes are usually solids/powders Solvents are usually liquids A few more examples… • Gatorade (Powder, water) • Coffee (Sugar, coffee) • Saltwater (Salt, water) 15 TYPES OF SOLUTIONS • Isotonic A solution with a solute concentration that is equal to the solute concentration inside a cell. TYPES OF SOLUTIONS • Hypertonic A solution with a solute concentration that is higher than the solute concentration inside a cell TYPES OF SOLUTIONS • Hypotonic A solution with a solute concentration that is lower than the solute concentration inside a cell POSTER PROJECT (DUE TODAY!) • 1= Hypertonic, Hypotonic, Isotonic When you finish, get a • 2= Solute, Solvent, Solution grade check sheet and turn both in! • Make a poster that shows the difference between the three terms. Include a picture, explanation, and color! • You can do a meme, comic, or poster. Be creative!