1. Chapter 7: The Muscular System
Muscle Tissue & Sarcomere Organization
Muscle Contraction
Muscle Fiber Type & Energy
Axial Musculature
Appendicular Musculature
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FINAL ROUND

2. Muscle Tissue & Sarcomere Organization: $100 Question
What structure divides the skeletal muscle into compartments and contains collagen fibers, elastic fibers, blood vessels, and nerves?
fascicle
endomysium
perimysium
epimysium
Answer: C
ANSWER
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3. Muscle Tissue & Sarcomere Organization: $100 Answer
What structure divides the skeletal muscle into compartments and contains collagen fibers, elastic fibers, blood vessels, and nerves?
fascicle
endomysium
perimysium
epimysium
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4. Muscle Tissue & Sarcomere Organization: $200 Question
Structures filled with extracellular fluid, formed by the tunneling of the sarcolemma through the muscle fiber, are called
transverse tubules (T tubules).
sarcomeres.
sarcoplasmic reticulum.
myofibrils.
Answer: A
ANSWER
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5. Muscle Tissue & Sarcomere Organization: $200 Answer
Structures filled with extracellular fluid, formed by the tunneling of the sarcolemma through the muscle fiber, are called
transverse tubules (T tubules).
sarcomeres.
sarcoplasmic reticulum.
myofibrils.
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6. Muscle Tissue & Sarcomere Organization: $300 Question
Which of the following accurately lists the levels of organization within a muscle from largest to smallest?
muscle fiber, myofilament, myofibril
myofilament, myofibril, muscle fiber
muscle fiber, myofibril, myofilament
Z line, A band, I band, M line
Answer: C
ANSWER
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7. Muscle Tissue & Sarcomere Organization: $300 Answer
Which of the following accurately lists the levels of organization within a muscle from largest to smallest?
muscle fiber, myofilament, myofibril
myofilament, myofibril, muscle fiber
muscle fiber, myofibril, myofilament
Z line, A band, I band, M line
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8. Muscle Tissue & Sarcomere Organization: $400 Question
Which of the following parts of a sarcomere contain the protein actin only?
I band
A band
H band
All of the answers are correct.
Answer: A
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9. Muscle Tissue & Sarcomere Organization: $400 Answer
Which of the following parts of a sarcomere contain the protein actin only?
I band
A band
H band
All of the answers are correct.
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10. Muscle Tissue & Sarcomere Organization: $500 Question
Which of the following statements regarding thick and thin filaments is true?
The actin molecules are oriented away from the center of the sarcomere, with the heads projecting outward.
The myosin molecules are oriented toward the center of the sarcomere, with the heads projecting outward.
The actin molecules are oriented toward the center of the sarcomere, with the heads projecting inward.
The myosin molecules are oriented toward the center of the sarcomere, with the heads projecting inward.
Answer: B
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11. Muscle Tissue & Sarcomere Organization: $500 Answer
Which of the following statements regarding thick and thin filaments is true?
The actin molecules are oriented away from the center of the sarcomere, with the heads projecting outward.
The myosin molecules are oriented toward the center of the sarcomere, with the heads projecting outward.
The actin molecules are oriented toward the center of the sarcomere, with the heads projecting inward.
The myosin molecules are oriented toward the center of the sarcomere, with the heads projecting inward.
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12. Muscle Contraction: $100 Question
Both the synaptic cleft and the motor end plate contain which of the following enzymes?
acetylcholine
acetylcholinesterase
nicotinamide reductase
serotonin decarboxylase
Answer: B
ANSWER
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13. Muscle Contraction: $100 Answer
Both the synaptic cleft and the motor end plate contain which of the following enzymes?
acetylcholine
acetylcholinesterase
nicotinamide reductase
serotonin decarboxylase
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14. Muscle Contraction: $200 Question
Which of the following statements regarding an action potential at the sarcolemma of a skeletal muscle cell is true?
The passage of an action potential along the T tubules triggers a sudden, massive release of calcium ions by the terminal cisternae.
Calcium spreads over the entire sarcolemma surface to initiate the action potential.
The sudden, massive release of calcium ions triggers a sudden, massive release of calcium ions by the terminal cisternae.
Sarcolemma depolarization removes calcium ions from the cytoplasm.
Answer: A
ANSWER
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15. Muscle Contraction: $200 Answer
Which of the following statements regarding an action potential at the sarcolemma of a skeletal muscle cell is true?
The passage of an action potential along the T tubules triggers a sudden, massive release of calcium ions by the terminal cisternae.
Calcium spreads over the entire sarcolemma surface to initiate the action potential.
The sudden, massive release of calcium ions triggers a sudden, massive release of calcium ions by the terminal cisternae.
Sarcolemma depolarization removes calcium ions from the cytoplasm.
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16. Muscle Contraction: $300 Question
What is the biochemical explanation for rigor mortis?
The sarcoplasmic reticulum is unable to remove calcium ions from the sarcoplasm.
Skeletal muscle fibers have too much ATP stored, resulting in sustained muscle contractions.
Cross-bridges remain detached from the active sites on actin.
None of the answers is correct.
Answer: A
ANSWER
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17. Muscle Contraction: $300 Answer
What is the biochemical explanation for rigor mortis?
The sarcoplasmic reticulum is unable to remove calcium ions from the sarcoplasm.
Skeletal muscle fibers have too much ATP stored, resulting in sustained muscle contractions.
Cross-bridges remain detached from the active sites on actin.
None of the answers is correct.
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18. Muscle Contraction: $400 Question
Which of the following statements regarding skeletal muscle contraction is false?
Calcium ions bind to troponin, resulting in a conformational change in tropomyosin.
Cross-bridge binding, pivoting, and detachment are powered by the breakdown of ATP.
Acetylcholinesterase released by the synaptic terminal binds to receptors on the sarcolemma.
None of the statements is false.
Answer: C
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19. Muscle Contraction: $400 Answer
Which of the following statements regarding skeletal muscle contraction is false?
Calcium ions bind to troponin, resulting in a conformational change in tropomyosin.
Cross-bridge binding, pivoting, and detachment are powered by the breakdown of ATP.
Acetylcholinesterase released by the synaptic terminal binds to receptors on the sarcolemma.
None of the statements is false.
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20. Muscle Contraction: $500 Question
Which is the correct sequence of steps during the contraction cycle?
1. The attached myosin head pivots toward the center of the sarcomere, and ADP and a phosphate group are released.
2. The active site is exposed following the binding of calcium ions to troponin.
3. The myosin head is reactivated as it splits the ATP and captures released energy.
4. The myosin cross-bridge forms and attaches to the exposed active sites on actin filaments.
5. Cross-bridges detach when the myosin head binds another ATP molecule.
Answer: B
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21. Muscle Contraction: $500 Answer
Which is the correct sequence of steps during the contraction cycle?
1. The attached myosin head pivots toward the center of the sarcomere, and ADP and a phosphate group are released.
2. The active site is exposed following the binding of calcium ions to troponin.
3. The myosin head is reactivated as it splits the ATP and captures released energy.
4. The myosin cross-bridge forms and attaches to the exposed active sites on actin filaments.
5. Cross-bridges detach when the myosin head binds another ATP molecule.
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22. Muscle Fiber Type & Energy: $100 Question
Which of the following statements regarding fast skeletal muscle fibers is true?
They are small in diameter, have large glycogen reserves, and have relatively few mitochondria.
They are large in diameter, with relatively few mitochondria.
They have a greater oxygen supply than slow fibers.
All of the statements are true.
Answer: B
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23. Muscle Fiber Type & Energy: $100 Answer
Which of the following statements regarding fast skeletal muscle fibers is true?
They are small in diameter, have large glycogen reserves, and have relatively few mitochondria.
They are large in diameter, with relatively few mitochondria.
They have a greater oxygen supply than slow fibers.
All of the statements are true.
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24. Muscle Fiber Type & Energy: $200 Question
Which of the following areas of the human body are dominated by slow fibers?
eye and hand muscles
back and calf muscles
hand and foot muscles
pelvic and leg muscles
Answer: B
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25. Muscle Fiber Type & Energy: $200 Answer
Which of the following areas of the human body are dominated by slow fibers?
eye and hand muscles
back and calf muscles
hand and foot muscles
pelvic and leg muscles
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26. Muscle Fiber Type & Energy: $300 Question
Which of the following statements regarding smooth muscle tissue is true?
It utilizes pacemaker cells as a control mechanism.
Tetanus cannot occur.
The actin and myosin filaments are scattered throughout the sarcoplasm.
It utilizes pacemaker cells as a control mechanism, and the actin and myosin filaments are scattered throughout the sarcoplasm.
Answer: D
ANSWER
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27. Muscle Fiber Type & Energy: $300 Answer
Which of the following statements regarding smooth muscle tissue is true?
It utilizes pacemaker cells as a control mechanism.
Tetanus cannot occur.
The actin and myosin filaments are scattered throughout the sarcoplasm.
It utilizes pacemaker cells as a control mechanism, and the actin and myosin filaments are scattered throughout the sarcoplasm.
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28. Muscle Fiber Type & Energy: $400 Question
Which of the following statements correctly
describes isotonic contraction?
Tension produced never exceeds the resistance.
Tension remains at a constant level until relaxation occurs.
An example is the reflexive contractions that keep the body upright while standing or sitting.
All of the statements are correct.
Answer: B
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29. Muscle Fiber Type & Energy: $400 Answer
Which of the following statements correctly describes isotonic contraction?
Tension produced never exceeds the resistance.
Tension remains at a constant level until relaxation occurs.
An example is the reflexive contractions that keep the body upright while standing or sitting.
All of the statements are correct.
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30. Muscle Fiber Type & Energy: $500 Question
Which of the following statements about how skeletal muscles use and store energy is true?
At rest, muscles use glycogen stores for energy.
During light activity, muscles generate energy through the aerobic breakdown of carbohydrates, lipids, or amino acids.
At peak levels of activity, muscles generate energy by aerobic breakdown of carbohydrates, lipids, or amino acids.
Glycolysis produces ATP more efficiently than aerobic respiration.
Answer: B
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31. Muscle Fiber Type & Energy: $500 Answer
Which of the following statements about how skeletal muscles use and store energy is true?
At rest, muscles use glycogen stores for energy.
During light activity, muscles generate energy through the aerobic breakdown of carbohydrates, lipids, or amino acids.
At peak levels of activity, muscles generate energy by aerobic breakdown of carbohydrates, lipids, or amino acids.
Glycolysis produces ATP more efficiently than aerobic respiration.
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32. Axial Musculature: $100 Question
Which muscle inserts on the mandible and the skin of the cheek?
mylohyoid
stylohyoid
sternohyoid
platysma
Answer: D
ANSWER
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33. Axial Musculature: $100 Answer
Which muscle inserts on the mandible and the
skin of the cheek?
mylohyoid
stylohyoid
sternohyoid
platysma
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34. Axial Musculature: $200 Question
Which muscle has as its origin the spinous processes of the lower cervical and upper thoracic vertebrae?
iliocostalis
semispinalis capitis
quadratus lumborum
external intercostals
Answer: B
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35. Axial Musculature: $200 Answer
Which muscle has as its origin the spinous processes of the lower cervical and upper thoracic vertebrae?
iliocostalis
semispinalis capitis
quadratus lumborum
external intercostals
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36. Axial Musculature: $300 Question
Which muscle functions to stabilize the central tendon of the perineum?
ischiocavernosus
transverse perineus
rectus abdominis
external anal sphincter
Answer: B
ANSWER
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37. Axial Musculature: $300 Answer
Which muscle functions to stabilize the central tendon of the perineum?
ischiocavernosus
transverse perineus
rectus abdominis
external anal sphincter
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38. Axial Musculature: $400 Question
Which muscle(s) function(s) to elevate, protract, and/or move the mandible to either side?
masseter
temporalis
pterygoids
masseter and temporalis
Answer: C
ANSWER
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39. Axial Musculature: $400 Answer
Which muscle(s) function(s) to elevate, protract, and/or move the mandible to either side?
masseter
temporalis
pterygoids
masseter and temporalis
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40. Axial Musculature: $500 Question
Which muscle inserts on the last rib and the transverse processes of the lumbar vertebrae?
quadratus lumborum
iliocostalis
spinalis
longissimus
Answer: A
ANSWER
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41. Axial Musculature: $500 Answer
Which muscle inserts on the last rib and the transverse processes of the lumbar vertebrae?
quadratus lumborum
iliocostalis
spinalis
longissimus
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42. Appendicular Musculature: $100 Question
Which muscle is the major abductor of the arm?
infraspinatus
supraspinatus
deltoid
pectoralis major
Answer: C
ANSWER
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43. Appendicular Musculature: $100 Answer
Which muscle is the major abductor of the arm?
infraspinatus
supraspinatus
deltoid
pectoralis major
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44. Appendicular Musculature: $200 Question
Which muscle originates on the anterior and superior margins of ribs 1–9?
serratus anterior
subclavius
pectoralis minor
rhomboids
Answer: A
ANSWER
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45. Appendicular Musculature: $200 Answer
Which muscle originates on the anterior and superior margins of ribs 1–9?
serratus anterior
subclavius
pectoralis minor
rhomboids
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46. Appendicular Musculature: $300 Question
Which muscle does not insert on the greater tubercle of the humerus?
teres minor
subscapularis
pectoralis major
supraspinatus
Answer: B
ANSWER
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47. Appendicular Musculature: $300 Answer
Which muscle does not insert on the greater tubercle of the humerus?
teres minor
subscapularis
pectoralis major
supraspinatus
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48. Appendicular Musculature: $400 Question
Which muscle inserts on the bases of the second and third metacarpal bones?
flexor carpi ulnaris
palmaris longus
flexor carpi radialis
extensor carpi ulnaris
Answer: C
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49. Appendicular Musculature: $400 Answer
Which muscle inserts on the bases of the second and third metacarpal bones?
flexor carpi ulnaris
palmaris longus
flexor carpi radialis
extensor carpi ulnaris
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50. Appendicular Musculature: $500 Question
Which muscle acts to flex the knee, as well as perform adduction and medial rotation at the hip?
adductor brevis
pectineus
tensor fasciae latae
gracilis
Answer: D
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51. Appendicular Musculature: $500 Answer
Which muscle acts to flex the knee, as well as perform adduction and medial rotation at the hip?
adductor brevis
pectineus
tensor fasciae latae
gracilis
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52. contraction relaxation repeated twitching depolarization
FINAL ROUND Question
Curare is best known as the South American "poison arrow" toxin used for hunting. A synthetic form of curare is used routinely in emergency care to facilitate intubation.
Curare specifically blocks acetylcholine (ACh) receptors. What is the result of administering curare to a skeletal muscle group?
contraction
relaxation
repeated twitching
depolarization
Answer: B
ANSWER
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53. contraction relaxation repeated twitching depolarization
FINAL ROUND Answer
Curare is best known as the South American "poison arrow" toxin used for hunting. A synthetic form of curare is used routinely in emergency care to facilitate intubation.
Curare specifically blocks acetylcholine (ACh) receptors. What is the result of administering curare to a skeletal muscle group?
contraction
relaxation
repeated twitching
depolarization
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