Physio Test 2 Lecture 12& 13

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  1. What is the result of increasing myofibril proteins?
  2. What is it called when you do not change the number of cells, but only the size?
  3. What is it called when you increase the number of cells?
  4. What is it called when you get a shortening of the muscle?
  5. T/F: Riding a bike uphill is more isotonic than isometric
  6. Eccentric contraction: is it a real contraction?
  7. What is called when you lengthen a muscle while it tries to contract?
    Eccentric; example: when you're walk/running down a hill
  8. What produces negative work? More or less motor units contracting?
  9. Term: generates the maximum amount of tension when stimulated to contract?
  10. Term: stretching the muscle
  11. Term: contracting the muscle
  12. Mechanical leverage allows you to create a strong pull than_____
  13. In what kind of muscles do you have an origin and insersion?
    skeletal muscles
  14. In what kind of muscles do you not have a resting length?
  15. T/F: the curve for the cardiac cells is more on the left side of the skeletal graph.
  16. Recruitment is ______ summation;
    Summation is ______summation
  17. Intrafusal vs. extrafusal fibers correspond to what part of the muscle and what kind of neurons stimulate them?
  18. Muscle spindles are most prevalent in msucles that require the finest degree of control. T/F
  19. spindle apparatus serves as a -___ detector;
    Rapid stretching is a more powerful stimulus than a slower, more gradual stretching, so the force of this reflex contraction is greater in response to rapid stretch than a gradual stretch
  20. Disynaptic reflex
    involving the golgi tendon organs; this is the inhibitory golgi tendon organ reflex (because two synapses are crossed in the CNS)
  21. Reciprocal innervation
    Dual stimulatory and inhibitory activity
  22. What do you call the stimulation of alpha and gamma motoneurons simultaneously by upper motor neurons in the brain
    • coactivation
    • Ex. co-activation-->tap the tendon-->muscle is stretched-->muscle spindle apparatus gets stretched as well
  23. Contractions:
    Eccentric (technically not a contraction)
    • Isometric: when the tension is equal to the opposing force (load), the muscle stays the same length and produces an isometric contract
    • concentric: when the tension si greater han the load, the muscle shortens
    • Eccentric: when the force exerted on the muscle is greater than the force on muscle contraction, the muscle will be stretched by that force, thereby lengthening despite the contraction it created(ex. when you do a curl and are gently lowering it, your biceps produce an eccentric contraction
  24. monosynpatic stretch reflex
    • Does not depend on the activation of upper motor neurons
    • The simplest is when thes sensory neuron directly synapses with the motor neuron without involving spinal cord interneurons.
  25. Eccentric and Concentric contraction:
    when you're doing a curl, when you flex your forearm, your bicep brachii are doing a concentric contraction, when you gentily lower the dumbbell, your biceps produces an eccentric contraction, the force of contraction allows the dumbbell to be lowered gently against the force of gravity as your biceps lengthens
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Physio Test 2 Lecture 12& 13
Physio Test 2 Lecture 12&13
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