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Contraction phase of muscle twitch

Sarcomeres are shortening and force increase

lactic acid build up

occurs during prolonged muscle contraction

latent period of muscle twitch

includes all biochemical events from acetylcholine binding to receptors in sarcolemma through crossbridge formation

motor unit

Recruitment of these results in contractions of increasing force

Relaxation phase of muscle twitch

Cross-bridge disconnect and sarcomeres return to original length

Sarcoplasmic reticulum

structure activated by t-tuble depolarization to release ionic calcium


an extreme form of wave summation results in a steady, sustained contraction


muscle contraction results in a staircase shaped myogram (recording of the contraction)


molecule responsible for unblocking myosin-binding sites

Wave summation

Achieved by increased rate of nervous system stimulation

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