Practice Questions on the Muscular System
Page 1

  1. Which of the following cell types is responsible for skeletal muscle regeneration?
    1. Myoepithelial cell
    2. Myofibril
    3. Satellite cell
    4. Myofibroblast
    5. Fibroblast

  2. How many T-tubules lie within a single skeletal muscle sarcomere?
    1. 1
    2. 2
    3. 3
    4. 4

  3. Sarcoplasmic reticulum is the name given to which of the following?
    1. Rough endoplasmic reticulum in smooth muscle cells
    2. Smooth endoplasmic reticulum in cells of the epimysium
    3. Smooth endoplasmic reticulum in all muscle cells
    4. Rough endoplasmic reticulum in cardiac muscle cells

  4. The connective tissue layer that bundles skeletal muscle fibers into fascicles is the:
    1. Perichondrium
    2. Perineurium
    3. Perimysium
    4. Epimysium
    5. Endomysium

  5. An overlap of actin and myosin filaments occurs in the:
    1. A Band
    2. I Band
    3. Z Line
    4. H Band
    5. M Line

  6. In skeletal muscle, a triad refers to which of the following?
    1. A T tubule sandwiched between 2 dilated cisternae of the sarcoplasmic reticulum
    2. A Z line flanked by 2 A bands
    3. An A band flanked by 2 I bands
    4. An H zone flanked by 2 A bands
    5. A Z line flanked by 2 sarcomeres

  7. Which of the following does not describe skeletal muscle fibers?
    1. Striated
    2. Typically voluntary
    3. Multinucleate
    4. Branched

  8. Intercalated disks:
    1. Are found only in smooth muscle
    2. Are found in skeletal and cardiac muscle
    3. Are part of the neuromuscular junction in bipennate muscles
    4. Are located at the M line
    5. Contain desmosomes and gap junctions

  9. Motor units:
    1. Are found only in cardiac muscle
    2. Are largest in muscles responsible for delicate movements
    3. Consist of a muscle fiber and all the nerves that supply it
    4. Consist of a motor neuron and all the muscle fibers it supplies
    5. Are the same as neuromuscular junctions

  10. The cell type least likely to contain more than one nucleus is a(n):
    1. Skeletal muscle fiber
    2. Osteoclast
    3. Cardiac muscle cell
    4. Smooth muscle cell

    For the next 5 questions, use the following 4 choices.
    Answers may be used once, more than once, or not at all.
    1. Epimysium
    2. Perimysium
    3. Endomysium
    4. None of the above

  11. Surrounds individual myofilaments
  12. Surrounds whole named muscles
  13. Surrounds individual fascicles
  14. Surrounds individual muscle fibers
  15. The connective tissue wrapping around a muscle that is continuous with tendons is the:
    1. Perimysium
    2. Endomysium
    3. Epimysium
    4. Ectomysium

  16. In muscle tissue, neurotransmitter receptors are located:
    1. In synaptic vesicles
    2. On the motor neuron axon terminals
    3. In the synaptic cleft
    4. On the motor end plate

  17. An action potential is:
    1. A migrating region of membrane potential reversal
    2. A flow of electrons along the sarcolemma
    3. A nucleophilic reaction between Na and K ions
    4. Something that is only caused by acetylcholine

  18. Acetylcholinesterase:
    1. Produces acetylcholine
    2. Is the acetylcholine receptor in muscle tissue
    3. Is responsible for smooth but not skeletal muscle contraction
    4. Degrades the neurotransmitter which is found in the neuromuscular junction

  19. Tetanus toxin causes convulsive paralysis by:
    1. Blocking acetylcholine from binding to the muscarinic acetylcholine receptor
    2. Inhibiting acetylcholinesterase
    3. Causing motor neurons to release massive amounts of acetylcholine
    4. Blocking acetylcholine from being released by motor neurons

  20. A person suffering from nerve gas exposure is given atropine to counter the effects because:
    1. Atropine will bind to and electrophilically inactivate the nerve gas
    2. Atropine blocks the nerve gas receptor
    3. Atropine blocks the acetylcholine receptor which prevents the lingering excess ACh from having adverse effects
    4. Atropine inactivates acetylcholinesterase

  21. Which of the following is NOT TRUE?
    1. All muscle tissue is contractile
    2. Skeletal muscle is voluntary but smooth muscle is not
    3. Superficial fascia holds skin to muscle
    4. Muscles use the skeleton as leverage points as they push against bones to produce body movement

  22. Skeletal muscle is described by all of the following EXCEPT:
    1. Striated
    2. Voluntary
    3. Multinucleate
    4. Autorhythmic
    5. Contractile

  23. The walls of hollow organs and some blood vessels contain this type of muscle tissue.
    1. Striated
    2. Skeletal
    3. Cardiac
    4. Voluntary
    5. Smooth

  24. Which of the following is unique to cardiac muscle tissue?
    1. Involuntary
    2. Striated
    3. Non-striated
    4. Contains actin AND myosin
    5. Contains intercalated disks

  25. Approximately, what percentage of heat is generated by muscle tissue?
    1. 15%
    2. 35%
    3. 65%
    4. 85%
    5. 95%

  26. A muscle fascicle is a bundle of:
    1. Myofibrils
    2. Sarcomeres
    3. Fibers
    4. Muscles
    5. Muscle cells
    6. 2 of the above


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