BIOS 252 Final Exam Practice test questions and answers

BIOS 252 Final Exam Practice test ,f ,f ,f ,f ,f




1. Which of the following is a recognized function of
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skeletal muscle? ,f




1) A) guard body entrances and exits
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B) maintain posture ,f




C) maintain body temperature ,f ,f




D) produce movement ,f




E) all of the above ,f ,f ,f




2. Nerves and blood vessels that service the muscle ,f ,f ,f ,f ,f ,f ,f E
fibers are located in the connective tissues of the
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A) myofibrils.
B) sarcolemma.
C) endomysium.
D) sarcomere.
E) perimysium.

3. Which of the following best describes the term sar-
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coplasmic reticulum? ,f




A) largely made of myosin molecules ,f ,f ,f ,f




B) storage and release site for calcium ions ,f ,f ,f ,f ,f ,f




C) thin filaments are anchored here ,f ,f ,f ,f




D) proteinthataccountsforelasticityofrestingmus- cle ,f ,f ,f ,f ,f ,f ,f ,f




E) repeating unit of striated myofibrils ,f ,f ,f ,f




4. Interactions between actin and myosin filaments of ,f ,f ,f ,f ,f ,f D
the sarcomere are responsible for
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A) theconductionofneuralstimulationtothemuscle
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fiber.
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B) musclefatigue. ,f




C) the striped appearance of skeletal muscle.
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D) musclecontraction. ,f




E) musclerelaxation. ,f




5. Theregionofthesarcomerethatalwayscontainsthin E
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filaments is the ,f ,f




A) Z line. ,f




B) A band. ,f





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, BIOS 252 Final Exam Practice test ,f ,f ,f ,f ,f




C) H band. ,f




D) M line. ,f




E) I band. ,f




6. At rest,active sites on the actin are blocked by
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A) calcium ions. ,f




B) troponinmolecules. ,f




C) tropomyosin molecules. ,f




D) myosinmolecules. ,f




E) ATPmolecules. ,f




7. Cross-bridges are portions of ,f ,f ,f B
A) actin molecules. ,f




B) myosinmolecules. ,f




C) tropomyosin molecules. ,f




D) troponinmolecules. ,f




E) calcium ions. ,f




8. When a skeletal muscle fiber contracts,A) the zones E
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of overlap get larger.
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B) the H bands and I bands get smaller. ,f ,f ,f ,f ,f ,f ,f




C) the Z lines get closer together.D) the width of the A
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band remains constant.
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E) all of the above
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9. The following is a list of the events that occur during E a
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muscle contraction.1.Myosin cross-bridges bind to the
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actin.
,f




2. The free myosin head splits ATP. ,f ,f ,f ,f ,f




3. Calciumionis released fromthesarcoplasmic ,f ,f ,f ,f ,f ,f




reticulum.
,f




4. Themyosinheadpivotstowardthecenterofthe ,f ,f ,f ,f ,f ,f ,f ,f




sarcomere.
,f




5. Calcium ion binds to troponin. 6. The myosin head ,f ,f ,f ,f ,f ,f ,f ,f




binds an ATP molecule and detaches from the actin.
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The correct sequence of these events is
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A) 3,5,1,2,4,6. ,f ,f ,f ,f ,f




B) 1,4,6,2,3,5. ,f ,f ,f ,f ,f




C) 1,3,5,4,6,2. ,f ,f ,f ,f ,f




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, BIOS 252 Final Exam Practice test ,f ,f ,f ,f ,f




D) 5,1,4,6,2,3. ,f ,f ,f ,f ,f




E) 3,5,1,4,6,2. ,f ,f ,f ,f ,f




10. Activesitesontheactinbecomeavailableforbinding D
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after
A) troponinbindstotropomyosin.B)calciumbinds to ,f ,f ,f ,f ,f ,f ,f




tropomyosin. C) myosin binds to troponin.
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D) calcium binds to troponin. ,f ,f ,f




E) actin binds to troponin. ,f ,f ,f




11. In an isotonic contraction,
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A) muscletensionexceedstheloadandthemuscle ,f ,f ,f ,f ,f ,f ,f




lifts the load. B) many twitches fuse into one.
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C) tension rises and falls but the muscle length is ,f ,f ,f ,f ,f ,f ,f ,f




constant.
,f




D) flexion is produced. ,f ,f




E) the peak tension is less than the load.,f ,f ,f ,f ,f ,f ,f




12. During anaerobic glycolysis ,f ,f D
A) oxygen is not consumed. ,f ,f ,f




B) pyruvic acid is produced. ,f ,f ,f




C) ATPisproduced. ,f ,f




D) all of the above ,f ,f ,f




E) B and C only ,f ,f ,f




13. The type of muscle fiber that is most resistant to
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fatigue is the fiber. ,f ,f ,f




A) intermediate
B) fast
C) high-density
D) anaerobic
E) slow

14. Shortening a muscle while it maintains constant ten- C ,f ,f ,f ,f ,f ,f ,f , f




sion is called ,f . ,f ,f




A) complete tetanus ,f




B) an isometric contraction ,f ,f




C) an isotonic contraction ,f ,f




D) incomplete tetanus ,f




E) an isokinetic contraction ,f ,f





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, BIOS 252 Final Exam Practice test
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15. Which of the following is not a characteristic of a
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musclecell? ,f




A) Conductivity
B) Excitability
C) Contractility
D) Plasticity
E) Extensibility

16. The most common lever systems in the body are
,f ,f D ,f ,f ,f ,f ,f ,f




those that have the applied force between the fulcrum and
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the load. These are called
,f ,f levers.
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A) fourth-class
B) second-class
C) fifth-class
D) third-class
E) first-class

17. Contracting the gastrocnemius muscles to elevate ,f ,f ,f ,f ,f D
the body on the toes involves a
,f lever.
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A) fourth-class
B) third-class
C) first-class
D) second-class
E) both B and C ,f ,f ,f




18. A muscle that inserts on the body of the mandible is A
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probablyinvolvedin ,f ,f




A) chewing.
B) blowing.
C) spitting.
D) kissing.
E) frowning

19. A muscle that assists the muscle that is primarily
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responsible for a given action is a(n) ,f ,f ,f ,f ,f ,f




A) antagonist.
B) originator.
C) levator.

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