L5.3.3.1: Muscle Response to Different Stimulation Rates

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Created by
Ayen B.

Cards (6)

  • MUSCLE RESPONSE TO DIFFERENT STIMULATION RATES
    • Twitch
    • Summoning of Contractions
    • Unfused (Incomplete) Tetanus
    • Fused (Complete) Tetanus
  • TWITCH
    ● Single, brief contraction
    ● Not a normal muscle function
    ● A single stimulus causes muscle contraction and relaxation
  • SUMMONING OF CONTRACTION
    ● As stimuli are delivered more frequently, the muscle does not have time to
    completely relax before the next stimulus
    ● Contraction force increases because effects of the individual twitches are summed (added)
  • UNFUSED (INCOMPLETE) TETANUS
    ● Further fusion of the twitches (unfused tetanus) occurs as stimuli are delivered at a still faster rate
  • FUSED (COMPLETE) TETANUS
    ● A smooth continuous contraction without any evidence of relaxation, results from a very rapid rate of stimulation
  • Points at which stimuli are delivered are indicated by red arrows. Tension (measured in grams) on the vertical axis refers to the relative force of muscle contraction.