Chapter 12.9: Graded Potential vs Action Potentia, Velocity of AP Propagation

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<p>Graded potentials</p>

Graded potentials

  • occur in neuron’s receptive region from ion flow through chemically gated channels

  • positive or negative changes

  • graded

    • larger potential change to stronger stimulus

  • local (travel short distances)

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<p>Action potentials</p>

Action potentials

  • neurons conductive region (axon) flow voltage gated channels

  • depolarization Na+in and repolarization of K+ out

  • all or none threshold

  • propagate down entire axon to synpatic knob

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Velocity of AP propagation

  • conduction speed depends on axon diament and myelination

  • thicker fibers faster than thin

    • thick less resistance to flow

  • myelination faster than unmyelinated

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