Summation

    Cards (4)

    • Unlikely one impulse along presynaptic neurone will result is a generator potential above threshold required to trigger an action potential; summation is when several impulses arrive over a very short period and result in an above threshold
    • Temporal Summation: Impulse sequence arrival along one neurone over a short period, Spatial Summation: Impulse number arrival along several presynaptic neurones at same time (convergence)
    • Temporal (time, frequency)
      A) presynaptic
      B) action
      C) postsynaptic
      D) series
      E) presynaptic
      F) generator
      G) postsynaptic
      H) action
    • Spatial (Convergence)
      A) presynaptic
      B) action
      C) postsynaptic