cell membranes and osmoregulation
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Cell Membranes and Osmoregulation. Ch 7 and Ch 44. Outline. Types of membrane proteins Integral Transport Channels – Facilitated diffusion EX: Aquaporin Gated Channels Pumps – Na-K Enzyme Signal Transduction Peripheral Gap Junction Plant = plasmodemata

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Presentation Transcript
outline
Outline
  • Types of membrane proteins
    • Integral
      • Transport
        • Channels – Facilitated diffusion EX: Aquaporin
        • Gated Channels
        • Pumps – Na-K
      • Enzyme
      • Signal Transduction
    • Peripheral
      • Gap Junction
        • Plant = plasmodemata
        • Animal – 3 types ( Tight, Desmosomes, Gap)
      • Cell-to-cell recognition
      • Attachment to EMC and cytoskeleton
  • Membrane Structure results in selective permeability, transport, osmoregulation
  • The Kidney
the fluid mosaic model
The Fluid Mosaic Model
  • Structural components of the membrane are weakly bonded and flow laterally
  • How is the above experiment evidence of this concept?
the mosaic diverse structures and functions of membrane proteins
The Mosaic: Diverse Structures and Functions of Membrane Proteins

Aquaporin,

Na-K Pump

Cell junctions

Part of the ER, help modify and assemble

Antigens and antibodies

Insulin Receptor

integral vs peripheral
Integral vs Peripheral

Transmembrane; Amphipathic, Alpha-helix coils

Extracellular matrix and cytoskeleton

how do membranes get their proteins sidedness
How do membranes get their proteins? Sidedness?
  • See Figure 7.12 and sketch the Draw It! assignment in your notebook
  • Role of the endomembrane system?
  • Endogenous or Exogenous?
cellular junctions
Cellular Junctions
  • Plants
    • Plasmodesmata
      • Allow ions to pass from cell to cell.
  • Animals
    • Junctions are specialized for certain functions
animal junctions
Animal Junctions
  • Tight Junction: Prevents movement of fluid between cells.
  • Desmosome: Adheres two cells, very common in epidermis
  • Gap Junction: Allows ions to pass directly from cell to cell
movement of water is especially important to cells
Movement of water is especially important to cells
  • Where might the hydrophobic parts be?
  • Hydrophilic?
  • How might influx of water be controlled?
osmoregulation
Osmoregulation
  • Balance between uptake and loss of water and solutes
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