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Fall 01 Muscle Exam Version C

Match the description on the left with the choice on the right:
1. CT around muscle cell / fiber                             a. aponeurosis d. tendon
2. more movable / less proximal muscle attachment            b. insertion   e. endomysium
3. sheet-like dense regular CT, attaches muscle              c. fascicle   ab. origin

4. Thin filaments are made of all of the following EXCEPT
a. actin
b. myosin
c. troponin
d. tropomyosin
e. all are correct

5. The A bands of skeletal muscle
a. appear light
b. appear dark
c. appear shorter during contraction
d. lengthen during contraction
e. have no role in contraction

6. These structures carry the action potential from the surface of a muscle cell membrane deep
into the interior of the cell
a. mitochondria
b. sarcolemma
c. sarcoplasm
d. myofibrils
e. T tubules

7. This regulatory protein blocks actin binding sites, preventing crossbridges, but does not bind
Ca++.
a. troponin
b. tropomyosin
c. myosin
d. triad
e. globular

8. Enzyme that breaks up the muscle neurotransmitter, ending the nerve stimulus on the muscle
cell.
a. Na+
b. Ca++
c. acetylcholine esterase
d. junctional fold
e. acetylcholine
9. A type of muscle contraction in which the muscle LENGTHENS as it contracts.
a. isometric
b. isotonic
c. concentric
d. eccentric
e. latent period

10. Your legs have gross, not fine, motor skills. The motor units :
a. have many muscle fibers for the same motor neuron
b. have few muscle fibers for the same motor neuron
c. have the same number of muscle fibers in all body muscles
d. all of the above.

11. In muscle fibers, this chemical stores oxygen to be used during contraction.
a. myoglobin
b. creatine phosphokinase
c. sarcoplasmic reticulum
d. Ca++
e. calmodulin

12. The breakdown of glucose to pyruvic acid
a. yields 2 pyruvic acids from each glucose
b. makes 2 net ATP
c. is called glycolysis
d. is anaerobic, because O2 is not needed
e. all of the above

13. When the circulatory system can no longer deliver enough oxygen to muscle cells, this is
reached
a. relaxation period
b. latent period
c. aerobic threshold
d. anaerobic threshold
e. creatine phosphate

14. Muscle fibers that primarily use fat as fuel, appear red and would be found at high levels in
marathon runners are
a. slow oxidative, fatigue resistant
b. fast glycolytic, fatigue resistant
c. fast, glycolytic, fatigable
d. slow oxidative, fatigable

15. Athletes sometimes complain of oxygen debt, a condition that results when insufficient
oxygen is available to completely break down pyruvic acid. As a result, pyruvic acid is converted
to
a. hydrochloric acid
b. a strong base
c. lactic acid
d. stearic acid
16. Rigor mortis occurs because
a. proteins are beginning to break down, thus preventing flow of calcium ions.
b. the cells are dead (think technically here)
c. sodium ions leak out of the muscle
d. ATP is required to release the attached actin and myosin molecules

17. Muscle cells that contract as a unit, are connected by gap junctions, and often have
spontaneous action potentials as found in the digestive tract are
a. multiunit
b. cardiac
c. skeletal
c. single unit

18. When muscles are not stimulated, they maintain constant size
a. true
b. false

19. Theoretically, if a muscle were stretched to the point where thick and thin filaments no
longer overlapped,
a. no muscle tension would be generated
b. maximum force would be produced over the maximum range of travel
c. cross bridge attachment would be optimum because of all of the free binding sites on actin
d. ATP consumption would increase since the sarcomere is “trying” to contract

20. The heart works effectively when cardiac cells are at tetany
a. true
b. false

21. extends knee, stabilizes patella                a. Buccinator
22. plantar flex & evert                            b. Infraspinatus
23. suck in cheek                                   c. Rhomboideus, min & maj
24. raise hyoid, 2 bellies                          d. Extensor carpi radialis
25. retract scapula, square shoulder                e. Serratus ventralis
26. extend spine, lateral bend                      ab. Fibularis (peroneus)
27. punch, hold scapula to chest                    ac. External obliques
28. holds head into glenoid, rotate laterally       ad. Digastric
29. extend & abduct wrist                           ae. Erector spinae
30. flex spine, support viscera                     bc. Vastus medialis

31. The insertion of sternocleidomastoid is
a. sternum
b. clavicle
c. mastoid process of tibia
d. mastoid process of temporal bone
e. iliac crest
32. Which muscle is used in breathing?
a. internal intercostalis
b. diaphragm
c. external intercostalis
d. all of the above
e. none of the above

33. With age, muscles
a. hypertrophy
b. atrophy
c. have more fibrosis
d. lose flexibility
e. all but a

34. Which of the following muscles attach to the hip bones?
a. transverses abdominus
b. triceps brachii
c. vastus medialis
d. longissimus group of erector spinae

35. Which of the following insert on the ARM?
a. biceps brachii
b. triceps brachii
c. trapezius
d. coracobrachialis

36. Leg muscles that can cause movement at the knee joint include:
a. tibialis anterior
b. fibularis longus
c. gastrocnemius
d. soleus

37. Which of the following insert distal to the tarsus?
a. soleus
b. tibialis anterior
c. extensor hallicus longus
d. peroneus longus
e. all but a

38. In walking, which 2 lower limb muscles keep the forward-swinging foot from dragging on the
ground?
a. pronator teres and popliteus
b. flexor digitorum longus and popliteus
c. adductor longus and abductor digiti minimi in foot
d. gluteus medius and tibialis anterior

39. This muscle has fibers that run parallel to the length of the muscle
a. rectus abdominus
b. trapezius
c. pectoralis major
d. external oblique
40. Rotator cuff muscles include:
a. supraspinatus
b. infraspinatus
c. subscapularis
d. teres major
e. all of the above

SHORT ANSWERS:
1. How does botulism affect muscle function, what are some of the medical implications of this
condition?




2. Chao-Jung forcefully extended her knee while running for an alley shot on the tennis court
and pulled some muscles in her posterior thigh. Precisely what muscles were likely strained,
and what is the medical name for her condition?




3. Gary was injured in an automobile accident, resulting in severing of the motor neurons
innervating the quadriceps. Even though he has had extensive physical therapy, he is still
suffering muscle atrophy. Why is the therapy not working?




4. Robert, a chronic couch potato, decided very unexpectedly to walk his dog. The dog had
other ideas and turned a slow walk into a race for over an hour, leaving Robert out of breath.
The next day, Robert complained of soreness and stiffness in his legs. What caused this
problem?




5. For 10 points, describe how the muscular system interacts with 5 other organ systems.
6. Explain how muscle energy production changes throughout a moderate, then vigorous
workout.

				
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