Question 1

In bone,crystals of calcium phosphate impregnate the extracellular matrix containing fibers of

Accepted Answer

A)  actin.
B)  cellulose.
C)  collagen.
D)  myosin.
E)  troponin.F) C) and D)
G) None of the above

Question 2

Which of these muscles has the greatest proportion of slow-twitch fibers?

Accepted Answer

A)  the gastrocnemius
B)  the soleus
C)  the lateral rectus
D)  chicken breast muscleE) A) and C)
F) A) and D)

Question 3

During a contraction in the smooth muscle,the calcium ions in the sarcoplasmic reticulum bind to the protein called

Accepted Answer

A)  troponin.
B)  tropomyosin.
C)  myosin.
D)  calmodulin.
E)  actinomyosin.F) C) and E)
G) A) and D)

Question 4

The myosin heads form a cross bridge with the neighboring actin filaments.The energy for the cross-bridge cycle and muscle contraction is provided by

Accepted Answer

A)  pyruvate.
B)  lactic acid.
C)  ATP.
D)  NADH.
E)  glucosE.F) A) and E)
G) All of the above

Question 5

Which of the following regarding bone growth is false?

Accepted Answer

A)  Cartilage of growth plates actively grow in lengthwise direction.
B)  Increase in bone thickness results from the adding of bone layers on top of the periosteum.
C)  Some cartilage remains after it is replaced by bone.
D)  Cartilage calcification encroaches on the cartilaginous growth plate.E) All of the above
F) A) and B)

Question 6

The movement of actin and myosin fibers is described by all of the following except

Accepted Answer

A)  the resulting myosin head attaches to the actin filament.
B)  myosin rolls up from one end,forming a ball.
C)  the myosin filament advances relative to the actin filament.
D)  the globular myosin head detaches from the actin filament.
E)  the myosin head returns to its original conformation.F) All of the above
G) C) and D)

Question 7

What is the association between tropomyosin and troponin molecules in resting striated muscle fibers?

Accepted Answer

A)  Tropomyosin holds the troponin in place on the myosin.
B)  Troponin holds the tropomyosin in place on the myosin.
C)  Tropomyosin holds the troponin in place on the actin.
D)  Troponin holds the tropomyosin in place on the actin.
E)  There is no known association.F) A) and B)
G) None of the above

Question 8

A cross bridge is the binding of which two proteins?

Accepted Answer

A)  actin and myosin
B)  actin and troponin
C)  myosin and troponin
D)  collagen and troponin
E)  myosin and collagenF) A) and D)
G) B) and C)

Question 9

Which of the following is required to detach myosin from actin?

Accepted Answer

A)  calcium
B)  ATP
C)  phosphate
D)  troponin
E)  tropomyosinF) A) and C)
G) A) and E)

Question 10

Impulses conducted along the transverse tubules of the muscle fiber stimulate the release of

Accepted Answer

A)  ATP.
B)  the binding of actin and myosin.
C)  tropomyosin and troponin binding.
D)  calcium ions.
E)  acetylcholinE.F) A) and D)
G) C) and E)

Question 11

Which of the following proteins is not associated with muscle contraction?

Accepted Answer

A)  tropomyosin
B)  fibrinogen
C)  actin
D)  myosin
E)  troponinF) D) and E)
G) A) and D)

Question 12

Select the incorrect statement related to muscles and muscle fibers.

Accepted Answer

A)  Muscle fibers are composed of myofibrils.
B)  Myofibrils are components of segments known as Z lines.
C)  Stacks of thick myofibrils produce dark bands,called the A band.
D)  I bands are composed of thin myofilaments.
E)  Sacromeres are the smallest subunits of muscle contraction.F) A) and B)
G) A) and C)

Question 13

Which of the following is required near actin and myosin in order to initiate muscle contraction?

Accepted Answer

A)  ATP
B)  calcium
C)  phosphate
D)  calcium and ATP
E)  calcium and phosphateF) A) and B)
G) B) and D)

Question 14

Production of lactic acid by muscles contributes to a lack of muscle force called

Accepted Answer

A)  muscle tension.
B)  muscle fatigue.
C)  muscle breakdown.
D)  muscle cramps.
E)  muscle failurE.F) C) and E)
G) B) and D)

Exam 47: The Musculoskeletal System

The myosin heads form a cross bridge with the neighboring actin filaments.The energy for the cross-bridge cycle and muscle contraction is provided by

Correct Answer
verified

Select the incorrect statement related to muscles and muscle fibers.

Correct Answer
verified

The movement of actin and myosin fibers is described by all of the following except

Correct Answer
verified

Which of the following proteins is not associated with muscle contraction?

Correct Answer
verified

Production of lactic acid by muscles contributes to a lack of muscle force called

Correct Answer
verified

Which of the following regarding bone growth is false?

Correct Answer
verified

During a contraction in the smooth muscle,the calcium ions in the sarcoplasmic reticulum bind to the protein called

Correct Answer
verified

What is the association between tropomyosin and troponin molecules in resting striated muscle fibers?

Correct Answer
verified

In bone,crystals of calcium phosphate impregnate the extracellular matrix containing fibers of

Correct Answer
verified

A cross bridge is the binding of which two proteins?

Correct Answer
verified

Which of these muscles has the greatest proportion of slow-twitch fibers?

Correct Answer
verified

Which of the following is required near actin and myosin in order to initiate muscle contraction?

Correct Answer
verified

Impulses conducted along the transverse tubules of the muscle fiber stimulate the release of

Correct Answer
verified

Which of the following is required to detach myosin from actin?

Correct Answer
verified

Exam 47: The Musculoskeletal System

The myosin heads form a cross bridge with the neighboring actin filaments.The energy for the cross-bridge cycle and muscle contraction is provided by

Correct AnswerverifiedShow Answer

Select the incorrect statement related to muscles and muscle fibers.

Correct AnswerverifiedShow Answer

The movement of actin and myosin fibers is described by all of the following except

Correct AnswerverifiedShow Answer

Which of the following proteins is not associated with muscle contraction?

Correct AnswerverifiedShow Answer

Production of lactic acid by muscles contributes to a lack of muscle force called

Correct AnswerverifiedShow Answer

Which of the following regarding bone growth is false?

Correct AnswerverifiedShow Answer

During a contraction in the smooth muscle,the calcium ions in the sarcoplasmic reticulum bind to the protein called

Correct AnswerverifiedShow Answer

What is the association between tropomyosin and troponin molecules in resting striated muscle fibers?

Correct AnswerverifiedShow Answer

In bone,crystals of calcium phosphate impregnate the extracellular matrix containing fibers of

Correct AnswerverifiedShow Answer

A cross bridge is the binding of which two proteins?

Correct AnswerverifiedShow Answer

Which of these muscles has the greatest proportion of slow-twitch fibers?

Correct AnswerverifiedShow Answer

Which of the following is required near actin and myosin in order to initiate muscle contraction?

Correct AnswerverifiedShow Answer

Impulses conducted along the transverse tubules of the muscle fiber stimulate the release of

Correct AnswerverifiedShow Answer

Which of the following is required to detach myosin from actin?

Correct AnswerverifiedShow Answer

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