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Lecture 10

Lecture 10: Skeletal Muscle II

TermDefinition
Concentric Contraction rapid contraction generating little force
Eccentic Contraction muscle elongates during contraction because the load is greater than the force the muscle can generate
Motor Unit a somatic motor neuron together with all the muscle fibers that it innervates
Innervation ratio ratio of motor neuron to number of muscle fibers the neuron innervates
Twitch result when an AP reaches one muscle fiber causing all the myofibrils to contract
Latent Period when excitation coupling is occuring
Period of Contraction when myosin and actin form the cross bridges and power strokes happen (max 100 ms)
Period of Relaxation Ca is returning to the SR (max 100 ms)
Temporal Summation another stimulus is applied before the muscle relaxes completely resulting in more tension (wave summation)
Fused Tetanus high stimulus frequencies where there is no relaxation between stimuli (complete tetanus)
Size Principal smaller motor units are always recruited first
White Muscle Fiber adapted for short burst of speed and power, fast twitch, fast fatigue, glycolytic
Red Muscle Fiber adapted for prolonged activity, slow oxidative and fast oxidative
Muscle Fatigue decreased force or power generated by a muscle as a consequence of exercise
Oxygen Debt amount of oxygen needed to restore the oxygen used from organs and tissue in the body after exercise
Created by: rlmurp09
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