Card Set Information

2011-04-19 00:44:26

Show Answers:

  1. Muscle Tension
    The force exerted by a contracting muscle on an object
  2. Load
    The opposing force exerted on the muscle by the object
  3. Work
    The Movement of the load by the muscle
  4. Isotonic
    When the muscle tension overcomes the load then the muscle can contract and move the load
  5. Isometric
    • When muscle tension develops but the load is not moved.
    • Can be deliberate or caused when the load exceeds the muscle tension that can be developed
  6. Motor unit
    One motor neuron and all the muscle fibers that it can innervate.
  7. Muscle twitch
    The response of a motor unit to a single action potential of its motor neuron
  8. Myogram
    A graphic recording of contractile activity
  9. Latent period
    The initial period of muscle contraction where muscle tension is beginning but not measurable
  10. Period of contraction
    A period of 10 - 100 ms where the muscle tension reaches its peak
  11. Period of relaxation
    The period after contraction where muscle tension decreases returning to baseline.
  12. Wave Summation
    When one or more stimuli occur before the muscle can fully relax from the initial stimuli
  13. Unfused (incomplete) tetanus
    Occurs when the muscle is stimulated at an increasingly faster rate while the relaxation time between twitches becomes shorter
  14. Fused (complete) tetanus
    Occurs when relaxation disappears and the muscle is constantly in a state of contraction
  15. Motor Unit Recruitment
    Occurs when the stimulus is greater than one motor unit can handle and thus must use the assistance of other motor units
  16. Threshold stimulus
    The amount if stimulus required to initiate contraction
  17. Maximal stimulus
    the amount of stimulus required to activate all motor units in a particular muscle
  18. Motor Unit Recruitment
  19. Muscle Energy
  20. Lactic acid
    An end product produce during anaerobic energy production which when released into the blood causes the muscles to feel sore
  21. What happen when ATP consumption exceeds ATP production?
    The muscle becomes increasingly weaker or fatigued
  22. What happenes when No ATP is available?
    The muscle stays in a continued state of contraction (cramp or if you’re dead rigor mortis)
  23. Muscle Fiber Type
    What are the two major pathway energy is being produced?
    Oxidative or Glycolytic
  24. Muscle Fiber Type
    Slow oxidative
    Muscle type often used for endurance over an extended period of time
  25. Muscle Fiber Type
    Fast oxidative
    Muscle type often used for normal everyday activities (walking and standing)
  26. Muscle Fiber Type
    Fast glycolytic
    Short bursts of power
  27. Smooth Muscle
    Longitudinal smooth muscle
    Runs parallel to the long axis therefore when the muscle contracts the organ shortens or dilates
  28. Smooth Muscle
    Circular smooth muscle
    Runs around the circumference of the organ and when it contracts it elongates the organ
  29. Smooth Muscle
    The alternating contraction and relaxation of the opposing muscles
  30. Smooth Muscle
    The nerves that innervate the smooth muscles
  31. Smooth Muscle