dots logo Chapter 5 - Muscular System

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