dots logo Chapter 5 - Muscular System

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