dots logo Chapter 5 - Muscular System

  1. Skeletal muscle tissue is:
    1. striated, single nucleus, involuntary
    2. striated, single nucleus, voluntary
    3. striated, multinucleate, voluntary
    4. unstriated, single nucleus, voluntary
  2. In order from most superficial to least superficial:
    1. epimysium → perimysium → endomysium
    2. endomysium → perimysium → epimysium
    3. perimysium → epimysium → endomysium
    4. perimysium → endomysium → epimysium
  3. A myofibril is the same length as a muscle fiber?
    1. true
    2. false
  4. In order from lest superficial to most superficial:
    1. myofibril → sarcomere → muscle fascicle → muscle fiber → skeletal muscle
    2. myofibril → muscle fascicle → sarcomere → muscle fiber → skeletal muscle
    3. sarcomere → myofibril → muscle fiber → muscle fascicle → skeletal muscle
    4. sarcomere → muscle fiber → myofibril → muscle fascicle → skeletal muscle
  5. Thin myofilaments are composed of actin, and thick myofilaments are composed of myosin?
    1. true
    2. false
  6. Which parts of a sarcomere are responsible for striations?
    1. Z lines and thin filaments
    2. Z lines and thick filaments
    3. M lines and thin filaments
    4. M lines and thick filaments
  7. Which neurotransmitter is responsible for skeletal muscle contractions?
    1. norepinephrine
    2. acetylcholine
    3. dopamine
    4. serotonin
  8. In skeletal muscle tissue, calcium binds with __________, causing __________ to no longer cover the active site, allowing for cross-bridge formation.
    1. troponin, tropomyosin
    2. tropomyosin, troponin
  9. Cardiac muscle differs from skeletal muscle in all ways except:
    1. single nucleus
    2. involuntary
    3. has intercalated discs
    4. striated
  10. Like skeletal muscle, cardiac muscle can undergo wave summation and tetanic contractions?
    1. true
    2. false
  11. Smooth muscle differs from skeletal muscle in all ways except:
    1. single nucleus
    2. involuntary
    3. calmodin rather than troponin
    4. no actin and myosin
  12. Which type of muscle tissue is least sensitive to extracellular calcium concentrations?
    1. smooth muscle tissue
    2. cardiac muscle tissue
    3. skeletal muscle tissue
    4. sensitivity is the same for all muscle tissue
  13. What best describes cardiac muscle tissue?
    1. pacemaker automacity, neural control limited to pace and tension
    2. pacemaker automacity, neural and hormonal control limited to pace and tension
    3. pacesetter automacity, neural and hormonal control limited to pace and tension
    4. a single neuromuscular junction on each muscle fiber
  14. The multipennate shoulder muscle is called a __________, and the parallel muscle on the front of a arm (providing flexion) a __________.
    1. deltoid, biceps
    2. deltoid, triceps
    3. pectoriais, biceps
    4. pectoriais, triceps
  15. The pectorialis muscle of a breast is a __________ muscle, and the orbicularis oris of the mouth is a __________.
    1. convergent, circular
    2. unipennante, wrapping
    3. bipennate, wrapping
    4. parallel, circular
  16. The fixed point of a muscle to bone is the insertion, and the movable point the origin.
    1. true
    2. false
  17. In a __________ class lever the fulcrum lies between the applied force and the load, and in a __________ class lever the load lies between in fulcrum and the applied force.
    1. first, second
    2. first, third
    3. second, first
    4. second, third
  18. A __________ class lever is used move your head up and down, and a __________ class lever is the most common lever.
    1. first, second
    2. first, third
    3. second, first
    4. second, third
  19. In extensior muscle the line of action crosses the posterior side, and in adduction the medial side?
    1. true
    2. false
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