Skeletal Muscle

25 Questions  I  By Ellis018
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Muscle Quizzes & Trivia
This lecture was given by Dr. Fitzovitz. It is on skeletal muscle. I will try to alter it later to incorporate information from the book.

  
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Questions and Answers

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  • 1. 
    Troponin and Tropomyosin wrap around which filament?
    • A. 

      Actin

    • B. 

      Myosin


  • 2. 
    In the relaxed state tropomyosin covers the binding site for actin or myosin
    • A. 

      Actin

    • B. 

      Myosin


  • 3. 
    What is myosin considered as being?
    • A. 

      Structural

    • B. 

      Mechanical

    • C. 

      Enzyme


  • 4. 
    Sarcomeres are the basic functional unit for which type of muscle?
    • A. 

      Skeletal

    • B. 

      Cardiac

    • C. 

      Smooth


  • 5. 
    The distance between what lines compose the sarcomere?
    • A. 

      I bands

    • B. 

      A bands

    • C. 

      Z lines

    • D. 

      H zones


  • 6. 
    Innervated by alpha motor neurons and produce force of contraction
    • A. 

      Extrafusal fibers

    • B. 

      Sensors

    • C. 

      Intrafusal fibers


  • 7. 
    The distance from one part of a sarcomere to the same part of the next sarcomere
    • A. 

      A band

    • B. 

      I band

    • C. 

      Z line

    • D. 

      H zone


  • 8. 
    Regulate sensors and is innervated gamma motor neurons
    • A. 

      Extrafusal fibers

    • B. 

      Sensors

    • C. 

      Intrafusal fibers


  • 9. 
    The entire length of the myosin filaments is known as
    • A. 

      I band

    • B. 

      H zone

    • C. 

      A band

    • D. 

      Z line


  • 10. 
    Contractile machinery is activated by a rise in...
    • A. 

      Calcium

    • B. 

      Magnesium

    • C. 

      Potassium

    • D. 

      Sodium


  • 11. 
    What terminates the contraction?
    • A. 

      Diffusion of calcium from cells

    • B. 

      The coupling of calcium and sodium

    • C. 

      Transport of calcium back into the SR

    • D. 

      An influx of more calcium


  • 12. 
    Produced as result of force generated by making & breaking crossbridges
    • A. 

      Passive tension

    • B. 

      Active tension

    • C. 

      Metabolic energy

    • D. 

      Velocity


  • 13. 
    What is required for active force?
    • A. 

      Calcium pulse

    • B. 

      Release of calcium from SR

    • C. 

      Transport of calcium back into the SR

    • D. 

      Extracellular fluid calcium


  • 14. 
    Causes flaccid paralysis
    • A. 

      Hypercalcemia

    • B. 

      Hypocalcemia


  • 15. 
    Causes spasms
    • A. 

      Hypercalcemia

    • B. 

      Hypocalcemia


  • 16. 
    In hypercalcemia extracellular calcium can block Na channels preventing action potentials. This leads to flaccid paralysis.
    • A. 

      True

    • B. 

      False


  • 17. 
    Is it the ATP binding that breaks cross bridges?
    • A. 

      Yes

    • B. 

      No


  • 18. 
    The activity  of myosin ATPase limits
    • A. 

      Power

    • B. 

      Velocity

    • C. 

      Work

    • D. 

      Tension


  • 19. 
    The best measurement of preload is?
    • A. 

      Passive tension

    • B. 

      Sarcomere length

    • C. 

      Effort

    • D. 

      Active tension


  • 20. 
    Check all that apply for isotonic contraction
    • A. 

      No change of force

    • B. 

      Tension does not increase

    • C. 

      Tension does increase

    • D. 

      Length decreases


  • 21. 
    Fibers for endurance!
    • A. 

      Type I

    • B. 

      Type II


  • 22. 
    Holding a heavy load uses less energy than repetitive drumming. True or false
    • A. 

      True

    • B. 

      False


  • 23. 
    Ways to regulate force...
    • A. 

      Preload

    • B. 

      Afterload

    • C. 

      Frequency

    • D. 

      Recruitment


  • 24. 
    This way to regulate the force is not available for the heart
    • A. 

      Preload

    • B. 

      Afterload

    • C. 

      Frequency

    • D. 

      Recruitment


  • 25. 
    Mechanism that provides ATP for contraction
    • A. 

      Direct phosphorylation

    • B. 

      Glucose

    • C. 

      Oxidation of fatty acids


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