LectureMuscle Web 10

LectureMuscle Web 10 - multicellular striated thin and...

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Unformatted text preview: multicellular striated thin and thick filaments sarcoplasmic reticulum Text Fig. 5.28 striations Sliding Filmament Hypothesis sarcomere Text Fig. 5.18 Text Fig. 5.17 See text Fig. 5.19 Text Fig. 5.22 ATP energy Time lag (~2ms) Excitation-contraction coupling (latent period) isometric isotonic If no ATP Control of Contraction Usual method of stimulation (skeletal muscle) is via nerves under CNS control A single muscle has several hundred or thousands of individual fibers Axons of a single motor neuron innervates several muscle fibers Simultaneous activation of a motor unit Several hundred motor units per fiber Motor unit 5 to > 1000 fibers per neuron Vertebrate skeletal muscle Invertebrate striated muscle motor end plates motor end plates not well defined not well defined multineuronal multineuronal innervation innervation Similar patterns in some fish muscles, muscle spindles Similar patterns in some fish muscles, muscle spindles twitch...
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LectureMuscle Web 10 - multicellular striated thin and...

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