Ch9T6-7.txt

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Author:
aphy101
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271788
Filename:
Ch9T6-7.txt
Updated:
2014-04-24 17:44:13
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profmwinston
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Description:
Chapter 9 Topics 6-7 Muscular Responses and Actions
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  1. ´╗┐The minimal stimulus needed to start a muscle contraction.
    Threshold Stimulus
  2. The contractile response of a single muscle fiber to the ACh released by a single action potential.
    Twitch
  3. A recording of the events of a muscle twitch.
    Myogram
  4. List the four main parts of a myogram.
    1) Stimulation 2) Latent Period 3) Contraction Period 4) Relaxation Period
  5. A brief delay between the time of stimulation and the beginning of contraction; may be less than 2 milliseconds.
    Latent Period
  6. The period when a muscle fiber is generating force or contracting.
    Contraction Period
  7. The period when a muscle fiber is decreasing tension.
    Relaxation Period
  8. Combining the force of individual twitches is known as what?
    Summation
  9. Contractions that lack relaxation due to sustained contraction resulting from summation.
    Tetanic Contractions
  10. A motor neuron and the muscle fibers it controls constitute a ______.
    Motor Unit
  11. The fewer muscle fibers in a motor unit, the more ______ the movements will be.
    Precise
  12. An increase in the number of activated motor units as stimulation increases and more motor units are needed.
    Recruitment
  13. During ______, smaller motor units are more easily stimulated and recruited earlier.
    Sustained Contractions
  14. A certain amount of sustained contractions in a muscle, even when a muscle appears to be at rest; is important for maintaining posture.
    Muscle Tone
  15. Type of contraction that produces movement of a body part.
    Isotonic
  16. Type of isotonic contraction in which shortening of a muscle occurs.
    Concentric Reaction
  17. Type of isotonic contraction in which lengthening of the muscle occurs.
    Eccentric Contraction
  18. Type of contraction in which muscle tension increases but no movements of body parts are produced.
    Isometric
  19. Whenever body parts move, muscles and bones interact together as mechanical devices called ______.
    Levers
  20. What are the four basic components of a lever system?
    1) a bar 2) a fulcrum or pivot on which the bar turns 3) an object moved against resistance 4) a force that supplies the energy to move the bar
  21. The immovable end of a muscle.
    Origin
  22. The moveable end of a muscle.
    Insertion
  23. The muscle primarily responsible for producing an action.
    Agonist or Prime Mover
  24. A muscle that assists the agonist.
    Synergist
  25. A muscle that resists the action of an agonist.
    Antagonist

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