Muscle Physiology Quiz

  1. Spindle-shaped cells with central nuclei, no striations



    A. Smooth Muscle
  2. Long, cylindrical, unbranched, multinucleated cells; nuclei located toward the periphery of the cell



    C. Skeletal muscle
  3. Striated; cells are uninucleated & branched; nuclei are centrally located



    C. Cardiac Muscle
  4. Which of the following is not a function of Skeletal muscle?





    E. Sensory Detection
  5. Muscle returns to its original shape after contraction or extension




    D. Elasticity
  6. Muscle extends (stretches)




    A. Extensibility
  7. Muscle contracts (shortens and thickens)




    D. Contractility
  8. Muscle receives and responds to stimuli (environmental changes inside or outside the body)




    D. Excitability
  9. A muscle fiber is the same as a fiber found in connective tissue.

    A. True
    B. False
    B. False (different)
  10. Individal muscle fiber = a muscle cell

    A. True
    B. False
    A. True
  11. What is the plasma or cell membrane of a muscle cell




    D, Transverse (T) Tubules
    E. Myofibrils
    A. Sarcolemma
  12. Cylindrical structures that run longitudinally through the myofiber; composed of thin and thick myofilaments

    A. Sarcolemma
    B. Sarcoplasm
    C. Sarcoplasmic Reticulum
    D, Transverse (T) Tubules
    E. Myofibrils
    E. Myofibrils
  13. Form of smooth endoplasmic reticulum; regulates intracellular levels of cascium




    D, Transverse (T) Tubules
    E. Myofibrils
    B. Sarcoplasmic Reticulum
  14. Cytoplasm; contains many nuclei. Contains large amounts of stored glycogen & a unique oxygen binding protein called myoglobin




    D, Transverse (T) Tubules
    E. Myofibrils
    A. Sarcoplasm
  15. Tunnel-like extensions of the sarcolemma tha ope to the exterior of the myofiber, found at each A-1 junction

    A. Sarcolemma
    B. Sarcoplasm
    C. Sarcoplasmic Reticulum
    D, Transverse (T) Tubules
    E. Myofibrils
    D. Transverse (T) Tubules
  16. The 3 proteins actin, tropomyosin, & troponin are part of which myofilaments

    A. Thick
    B. Thin
    B. Thin
  17. Predominant protein; the backbone of each thin filament is formed by two strands of actin that coil around each other (looks like a twisted double strand of pearls); the actin molecule contains a myosin-binding site for a myosin molecule



    C. Actin
  18. Tropomyosin spirals around the actin backbone; in the absence of calcium, tropomyosin blocks myosin from binding to actin.



    B. Tropomyosin
  19. Complex of three protein molecules; one
    binds to actin, another binds to tropomyosin, & the third binds to calcium ions; when calcium is present, troponin moves tropomyosin out of the way so that myosin can bind to actin.



    B. Troponin
  20. What is the smallest contractile unit of a muscle cell
    Sarcomeres
  21. The number of myofibers per motor unit is higher in muscles that exert fine control and higher in muscles whose movements are less precise.

    A. True
    B. False
    False
  22. Which of these structures is not part of a neuromuscular junction?





    D. all are part of junction
  23. The 3 major processes of skeletal muscle cell contraction are:

    A. Excitation/Inhibition
    B. Excitation
    C. Mechanism of contraction
    D. Excitation/Contraction Coupling
    B, C, D
Author
face12
ID
136570
Card Set
Muscle Physiology Quiz
Description
Quiz on Muscle Notes for Exam 2
Updated