bi2 - Cellular Transport Notes Ch 7.3 About Cell Membranes...

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Cellular Transport Notes Ch. 7.3
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About Cell Membranes 1.All cells have a cell membrane 1.Functions : a.Controls what enters and exits the cell to maintain an internal balance called homeostasis b.Provides protection and support for the cell TEM picture of a real cell membrane.
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1.Structure of cell membrane Lipid Bilayer -2 layers of phospholipids a.Phosphate head is polar (water loving) b.Fatty acid tails non-polar (water fearing) c.Proteins embedded in membrane About Cell Membranes (continued) Phospholipid Lipid Bilayer
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Proteins Membrane m Polar heads love water Non-polar tails hide from water . Carbohydrate cell markers Fluid Mosaic Model of the cell membrane
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4. Cell membranes have pores (holes) in it a.Selectively permeable : Allows some molecules in and keeps other molecules out a.The structure helps it be selective! About Cell Membranes (continued) Pores
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Outside of cell Inside of cell (cytoplasm ) Lipid Bilayer Proteins Transport Protein Phospholipids Carbohydrate chains Structure of the Cell Membrane Go to Section: Animations of membrane structure
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Passive Transport cell doesn’t use energy 1. Diffusion 2. Facilitated Diffusion 3. Osmosis Active Transport cell does use energy 1. Protein Pumps 2. Endocytosis 3. Exocytosis high low This is gonna be hard work!! high
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bi2 - Cellular Transport Notes Ch 7.3 About Cell Membranes...

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