dots logo Chapter 5 - Muscular System

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