Muscle Physiology 1

Contracting muscle is the tension for finish isometric

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Unformatted text preview: ential Build glycogen stores in certain muscle cell types Muscle ATP stores and supply: Small store of ATP available at onset of muscle activity Must be replenished immediately from: Phosphorylation of ADP by creatine phosphate Oxidative phosphorylation for moderate exercise Anaerobic glycolysis (blood and stored glycogen) for intense exercise If oxygen is plentiful, can use glucose and fatty acid from the blood via aerobic oxidative phosphorylation Mechanics of Skeletal Muscle Contraction Muscle Twitch: Factors affecting force generated by muscle fibers Regulation of the force generated by whole muscle Velocity of shortening Skeletal muscle can contract over a wide range of forces and velocities. Twitch: Contraction in a muscle fiber in response to single action potential All or nothing event for a given muscle fiber at rest, reproducible Can be defined for muscle fiber, motor unit, or whole muscle level Can vary in strength and shape by muscle type, diameter, “twitch type” Eye blink, natural, mainly observed and deconstructed in laboratory Phases of the muscle twitch: Latent period Time from action potential in muscle c...
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