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Weight and Work Skeletal Muscle

Weight and Work Skeletal Muscle. Definitions. Motor Unit : a motor neuron and all muscle fibers it innervates. Twitch : single contraction in response to a single stimulus/AP. Isotonic : muscular contraction where constant tension continues while the length of the muscle changes. Concentric

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Weight and Work Skeletal Muscle

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  1. Weight and WorkSkeletal Muscle

  2. Definitions • Motor Unit: a motor neuron and all muscle fibers it innervates. • Twitch: single contraction in response to a single stimulus/AP. • Isotonic: muscular contraction where constant tension continues while the length of the muscle changes. • Concentric • Eccentric • Isometric: muscular contraction against resistance in which the length of the muscle remains the same.

  3. Isotonic Contraction

  4. Isometric Contraction

  5. Work • Work is accomplished only when an object is moved. • Work = Force X Distance • Force = muscle tension required to overcome the load (weight of the object). • In an isometric contraction where no object is moved (muscles do not change length) the work done = zero.

  6. Load/Velocity relationship • Load is an important determinant of shortening velocity. Load = velocity

  7. Load/Velocity Relationship

  8. 3 Muscle Fiber Types Slow Oxidative Fast Oxidative Fast Glycolytic Postural muscles Bird flight muscles Mammal breast muscles

  9. Lithobatespipiens • Referred to as Ranapipiensalso. • Opportunistic feeders • Occurs through much of US and Canada (cosmopolitan) • Status is controversial: widespread, but most populations throughout range are decreasing rapidly. • Commonly used in research.

  10. HOMEWORK!!!! • Write an entire lab report, again. • Include answers to ALL labscribe questions WITHIN the body of the paper. • Follow my formatting instructions!!!!!! • Due on November 28/29.

  11. Next Week… • Have a GREAT Thanksgiving!!!

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