dots logo Chapter 5 - Muscular System

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