Plasma Membrane
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Plasma Membrane

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Plasma Membrane presentation

Plasma Membrane presentation

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    Plasma Membrane Plasma Membrane Presentation Transcript

    • Plasma Membrane: The Gate Keeper Ms. Polson Biology October 18,2009
    • Plasma Membrane Lesson Objectives
      • Students will be able to:
      • Use vocabulary related to transport across the plasma membrane
      • Differentiate between active and passive transport
      • Identify membrane structures that permit transport
      • Understand the function of the plasma membrane as a “gate keeper”
    • What is a Plasma Membrane?
      • All living cells have them
      • Selective permeability
      • Asymmetric
      • Gives cell structure
      • Cell-cell recognition
      • Fluid mosaic model
        • Lipid movement in bilayer
      • Maintains homeostasis
    • Animal and Plant Plasma (cell) Membrane
    • Plasma Membrane Function
      • Separate inside organelles from external environment
      • Regulate entrance and exit of substances
      • Transfer information
      • Establishment of electric potential difference
      • Site of biological activities
      • Attachment between cells
      • Removal of waste
    • Plasma Membrane Photograph: Cell Membrane
    • Plasma Membrane Structure
      • Lipids
        • Phosphlipids, Glycolipids, Steroids
        • Hydrophilic and hydrophobic properties
        • Gives flexibility
      • Proteins
        • Integral - transport channels
        • Peripheral - recognition sites
        • Determines membranes specific functions
      • Sugars
    • Lipid Bilayer Model Cross Section
      • Gorter and Grendel, 1925
      • Two sheets of lipids
        • 7.5 nm thick
      • Found around cell
      • Embedded with proteins
      • Strengthened with cholesterol molecules (animal)
    • Lipid Bilayer Model Phospholipid
      • Hydrophilic
        • Water loving
        • Phosphate end
        • Outside and inside
      • Hydrophobic
        • Water fearing
        • Lipid tail region
        • Center
    • Plasma Membrane Hydrophilic and Hydrophobic
    • Passive Transport Simple Diffusion
      • Result of inherent kinetic energy
        • Thermal motion or heat
      • No energy needed
      • Diffusion and osmosis
      • High concentration to low concentration: small molecules
        • O 2 , CO 2 , H 2 O
    • Simple Diffusion
    • Passive Transport Facilitated Diffusion
      • Proteins act as tunnels
      • Carrier proteins help larger polar molecules cross membrane
        • Glucose
      • Moves materials along concentration gradient
    • Active Transport
      • Energy is needed
      • Low concentration to high concentration
      • Movement of molecules up concentration gradient
      • Sodium-potassium pump
    • Active Transport
      • Movement of large substances by vesicles
        • Endocytosis – taking into cell
          • Phagocytosis
          • Pinocytosis
          • Receptor mediate
        • Exocytosis – expelling from cell
          • ER or Golgi Apparatus
    • Types of Solutions
      • Isotonic
        • Concentration of dissolved substances are the same inside and outside the cell
      • Hypotonic
        • Concentration of dissolved substances are lower outside than inside
      • Hypertonic
        • Concentration of dissolved substances are higher outside than inside
    • Homeostasis Plasma Membrane
      • Maintains constant internal environment
      • Controls movement of materials in and out of the cell as a “gate keeper”
        • Dynamic equilibrium
      • Separates cellular organelles from external environment
    • Vocabulary Review
      • Plasma Membrane
      • Homeostasis
      • Passive Transport
      • Simple Diffusion
      • Facilitated Diffusion
      • Active Transport
      • Hydrophilic
      • Hydrophobic
      • Endocytosis
      • Exocytosis
      • Isotonic
      • Hypertonic
      • Hypotonic
    • Questions… Comments… Thoughts?