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Physiology pt 4 - Coggle Diagram

- - - - Depolarization happening at axon, unmyelinated, electrical signal travels in ECF surrounding axon, signal is not as strong
      - Slow conduction, has to go along entire length
    - - Tight insulation
        
        Insulate conduction of signal, does a bit of a jump
        
        Force electrical currents to jump over insulation, impulse faster
      - Distant insulation
        
        Some travel into ECF
        
        Electrical currents save some energy, still slow
- - - - Ex: retina detects light and changes in it, retina gets hit and you see stars.
      - Specific types
    - - Direct generation of action potentials
        
        Free nerve endings. stimulus applied, AP in hillock, generated potential, triggers impluse and proagated to nervous system
      - Indirect
        
        Taste, cells that detect sugar, neurotransmitter stimulates first order neuron and the rest of the process happens the same way
        
        Specialize cells
      - Indirect vs direct- the release of neurotransmitter from sensory cells. Both generate receptor potential, both propagate, both selective to type of stimulus
- - - - The absolute refractory period, previous section is in refractory period so signal cannot go backwards
  - - - Conduction jumps from one node of Ranvier to the next, higher speed of conduction
        
        Node of Ranvier is where influx of sodium occurs
        
        More sodium voltage gated channels here
      - It jumps because the electrical currents are attracted to one another on the node, do not interact with ECF