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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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

        • 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

  • 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

Aquaporin,

Na-K Pump

Cell junctions

Part of the ER, help modify and assemble

Antigens and antibodies

Insulin Receptor


Integral vs Peripheral

Transmembrane; Amphipathic, Alpha-helix coils

Extracellular matrix and cytoskeleton


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

  • Plants

    • Plasmodesmata

      • Allow ions to pass from cell to cell.

  • Animals

    • Junctions are specialized for certain functions


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


Membrane structure results in selective permeability


Movement of water is especially important to cells

  • Where might the hydrophobic parts be?

  • Hydrophilic?

  • How might influx of water be controlled?


Osmosis and Tonicity control the movement of water


Osmoregulation

  • Balance between uptake and loss of water and solutes


Feedback control of osmoregulation…remember this?


Mammalian Excretory System


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