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

Cell Membranes and Osmoregulation

Ch 7 and Ch 44


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


Membrane structure results in selective permeability

Membrane structure results in selective permeability


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?


Osmosis and tonicity control the movement of water

Osmosis and Tonicity control the movement of water


Osmoregulation

Osmoregulation

  • Balance between uptake and loss of water and solutes


Feedback control of osmoregulation remember this

Feedback control of osmoregulation…remember this?


Mammalian excretory system

Mammalian Excretory System


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