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Contraction of skeletal muscle fibers

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Muscle fatigue
Inability of muscle fibers to contract after long period of contraction.
latent period
Phase of contraction; time between muscle fiber stimulation and measurement of force generation.
Motor Unit
Motor neuron and all the muscle fibers it innervates.
Contractile period
Phase of contraction; period of force generation.
Unfused tetanus
Type of wave summation with partial relaxation observed between twitches.
Motor unit recruitment
Increasing the number of motor units that are stimulated to contract.
Twitch
Single contractile event in response to single action potential.
Relaxation period
Phase of contraction; period during which more crossbridges detach than reattach to thin filaments.
fused tetanus
Type of wave summation with no observable relaxation between twitches.