Question 1

The structural theory that explains how a muscle fiber contracts is called the ________ theory.

Accepted Answer

A)   sliding filament
B)   excitation-contraction coupling
C)   neuromuscular
D)   muscle contraction
E)   action-myosin interactionF) B) and E)
G) A) and B)

Question 2

When acetylcholine binds to receptors at the motor end plate, the sarcolemma becomes

Accepted Answer

A)   more permeable to sodium ions.
B)   less permeable to sodium ions.
C)   more permeable to calcium ions.
D)   less permeable to potassium ions.
E)   less permeable to potassium and sodium ions.F) B) and C)
G) A) and B)

Question 3

Thick filaments are made of the protein

Accepted Answer

A)   actin.
B)   titin.
C)   myosin.
D)   tropomyosin.
E)   nebulin.F) B) and E)
G) B) and C)

Question 4

Figure 10-1 Skeletal Muscle Fiber
 
Use Figure 10-1 to answer the following questions:
-Identify the structure(s)  where ATP is consumed?

Accepted Answer

A)   3
B)   6
C)   3 and 6
D)   7
E)   3 and 7F) B) and D)
G) A) and D)

Question 5

How would the loss of acetylcholinesterase from the motor end plate affect skeletal muscle?

Accepted Answer

A)   It would make the muscles less excitable.
B)   It would produce muscle weakness.
C)   It would cause muscles to stay contracted.
D)   It would cause muscles to stay relaxed.
E)   It would have little effect on skeletal muscles.F) D) and E)
G) A) and E)

Question 6

The following is a list of the events that occur during a muscle contraction. What is the correct sequence of these events?
1)  Myosin cross-bridges bind to the actin.
2)  The free myosin head splits ATP.
3)  Calcium ion is released from the sarcoplasmic reticulum.
4)  The myosin head pivots toward the center of the sarcomere.
5)  Calcium ion binds to troponin.
6)  The myosin head binds an ATP molecule and detaches from the actin.

Accepted Answer

A)   1, 3, 5, 4, 6, 2
B)   5, 1, 4, 6, 2, 3
C)   3, 5, 1, 2, 4, 6
D)   3, 5, 1, 4, 6, 2
E)   1, 4, 6, 2, 3, 5F) B) and D)
G) None of the above

Question 7

A muscle produces its highest tension when in complete

Accepted Answer

A)   recovery.
B)   treppe.
C)   wave summation.
D)   aerobic metabolism.
E)   tetanus.F) A) and C)
G) All of the above

Question 8

The narrow space between the synaptic terminal and the muscle fiber is the

Accepted Answer

A)   synaptic knob.
B)   motor end plate.
C)   motor unit.
D)   synaptic cleft.
E)   M line.F) All of the above
G) A) and B)

Question 9

During the recovery period following exercise, all of the following are true except

Accepted Answer

A)   lactic acid is removed from muscle cells.
B)   the muscle actively produces ATP.
C)   muscle fibers are unable to contract.
D)   oxygen is consumed at above the resting rate.
E)   heat is generated.F) B) and E)
G) A) and C)

Question 10

Which of the following allows muscles to return to their original shape during relaxation?

Accepted Answer

A)   gravity
B)   opposing muscle contractions
C)   elastic forces
D)   myosin binding
E)   gravity, opposing muscle contractions, and elastic forcesF) C) and D)
G) D) and E)

Question 11

Which of the following statements about excitation-contraction coupling is incorrect?

Accepted Answer

A)   Calcium ions travel through the transverse tubule.
B)   Calcium ion is released from the sarcoplasmic reticulum.
C)   Tropomyosin moves to expose myosin binding sites on actin.
D)   Troponin binds calcium ion and signals tropomyosin to move.
E)   Relaxation requires uptake of calcium ion by the sarcoplasmic reticulum.F) B) and C)
G) D) and E)

Question 12

Put the following structures in order from superficial to deep.
1)  muscle fiber
2)  perimysium
3)  myofibril
4)  fascicle
5)  endomysium
6)  epimysium

Accepted Answer

A)   1, 5, 4, 3, 2, 6
B)   6, 2, 5, 4, 1, 3
C)   6, 2, 4, 5, 1, 3
D)   1, 3, 5, 6, 4, 2
E)   2, 3, 1, 4, 6, 5F) C) and D)
G) A) and E)

Question 13

Describe the basic sequence of events that occurs as an action potential arrives at the neuromuscular junction and is transmitted to the muscle cell.

Accepted Answer

The action potential triggers the exocyt...

Question 14

The area in the center of the A band that contains no thin filaments is the

Accepted Answer

A)   Z line.
B)   M line.
C)   H band.
D)   I band.
E)   zone of overlap.F) B) and E)
G) B) and D)

Question 15

Identify the incorrect statement about a single motor unit.

Accepted Answer

A)   The more neurons involved, the more powerful the contraction.
B)   The smaller the number of muscle fibers, the more precise the movement.
C)   Fine motor skills depend on the development of small motor units.
D)   Some motor units include as many as 2000 muscle fibers.
E)   Muscle fibers of one motor unit intermingle with the fibers of another motor unit.F) A) and D)
G) All of the above

Question 16

After death, muscle fibers run out of ATP and calcium begins to leak from the sarcoplasmic reticulum into the sarcoplasm. This results in a condition known as

Accepted Answer

A)   tetany.
B)   treppe.
C)   depolarization.
D)   rigor mortis.
E)   oxygen debt.F) A) and B)
G) None of the above

Question 17

Active sites become exposed when calcium ions bind to

Accepted Answer

A)   tropomyosin.
B)   actin.
C)   myosin.
D)   troponin.
E)   calcium channels.F) B) and C)
G) A) and B)

Question 18

Figure 10-1 Skeletal Muscle Fiber
 
Use Figure 10-1 to answer the following questions:
-What is released from the structure labeled "9"?

Accepted Answer

A)   sarcoplasm
B)   acetylcholine
C)   protein
D)   calcium ions
E)   acetylcholinesteraseF) A) and B)
G) A) and C)

Question 19

Figure 10-1 Skeletal Muscle Fiber
 
Use Figure 10-1 to answer the following questions:
-Where are the myosin molecules located?

Accepted Answer

A)   4
B)   5
C)   6
D)   7
E)   8F) B) and E)
G) A) and E)

Question 20

The protein that regulates muscle contraction by controlling the availability of active sites on actin is called

Accepted Answer

A)   actin.
B)   titin.
C)   myosin.
D)   tropomyosin.
E)   nebulin.F) All of the above
G) A) and B)

Exam 10: Muscle Tissue

Which of the following allows muscles to return to their original shape during relaxation?

Correct Answer
verified

A muscle produces its highest tension when in complete

Correct Answer
verified

Correct Answer
verified

After death, muscle fibers run out of ATP and calcium begins to leak from the sarcoplasmic reticulum into the sarcoplasm. This results in a condition known as

Correct Answer
verified

Describe the basic sequence of events that occurs as an action potential arrives at the neuromuscular junction and is transmitted to the muscle cell.

Correct Answer
verified
The action potential triggers the exocyt...
View Answer

Figure 10-1 Skeletal Muscle Fiber Use Figure 10-1 to answer the following questions: -Where are the myosin molecules located?

Correct Answer
verified

Active sites become exposed when calcium ions bind to

Correct Answer
verified

Thick filaments are made of the protein

Correct Answer
verified

Which of the following statements about excitation-contraction coupling is incorrect?

Correct Answer
verified

Identify the incorrect statement about a single motor unit.

Correct Answer
verified

Figure 10-1 Skeletal Muscle Fiber Use Figure 10-1 to answer the following questions: -Identify the structure(s) where ATP is consumed?

Correct Answer
verified

Figure 10-1 Skeletal Muscle Fiber Use Figure 10-1 to answer the following questions: -What is released from the structure labeled "9"?

Correct Answer
verified

The narrow space between the synaptic terminal and the muscle fiber is the

Correct Answer
verified

The area in the center of the A band that contains no thin filaments is the

Correct Answer
verified

During the recovery period following exercise, all of the following are true except

Correct Answer
verified

Put the following structures in order from superficial to deep. 1) muscle fiber 2) perimysium 3) myofibril 4) fascicle 5) endomysium 6) epimysium

Correct Answer
verified

How would the loss of acetylcholinesterase from the motor end plate affect skeletal muscle?

Correct Answer
verified

The protein that regulates muscle contraction by controlling the availability of active sites on actin is called

Correct Answer
verified

When acetylcholine binds to receptors at the motor end plate, the sarcolemma becomes

Correct Answer
verified

The structural theory that explains how a muscle fiber contracts is called the ________ theory.

Correct Answer
verified

Exam 10: Muscle Tissue

Which of the following allows muscles to return to their original shape during relaxation?

Correct AnswerverifiedShow Answer

A muscle produces its highest tension when in complete

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

After death, muscle fibers run out of ATP and calcium begins to leak from the sarcoplasmic reticulum into the sarcoplasm. This results in a condition known as

Correct AnswerverifiedShow Answer

Describe the basic sequence of events that occurs as an action potential arrives at the neuromuscular junction and is transmitted to the muscle cell.

Correct AnswerverifiedThe action potential triggers the exocyt...View AnswerShow Answer

Figure 10-1 Skeletal Muscle Fiber Use Figure 10-1 to answer the following questions: -Where are the myosin molecules located?

Correct AnswerverifiedShow Answer

Active sites become exposed when calcium ions bind to

Correct AnswerverifiedShow Answer

Thick filaments are made of the protein

Correct AnswerverifiedShow Answer

Which of the following statements about excitation-contraction coupling is incorrect?

Correct AnswerverifiedShow Answer

Identify the incorrect statement about a single motor unit.

Correct AnswerverifiedShow Answer

Figure 10-1 Skeletal Muscle Fiber Use Figure 10-1 to answer the following questions: -Identify the structure(s) where ATP is consumed?

Correct AnswerverifiedShow Answer

Figure 10-1 Skeletal Muscle Fiber Use Figure 10-1 to answer the following questions: -What is released from the structure labeled "9"?

Correct AnswerverifiedShow Answer

The narrow space between the synaptic terminal and the muscle fiber is the

Correct AnswerverifiedShow Answer

The area in the center of the A band that contains no thin filaments is the

Correct AnswerverifiedShow Answer

During the recovery period following exercise, all of the following are true except

Correct AnswerverifiedShow Answer

Put the following structures in order from superficial to deep. 1) muscle fiber 2) perimysium 3) myofibril 4) fascicle 5) endomysium 6) epimysium

Correct AnswerverifiedShow Answer

How would the loss of acetylcholinesterase from the motor end plate affect skeletal muscle?

Correct AnswerverifiedShow Answer

The protein that regulates muscle contraction by controlling the availability of active sites on actin is called

Correct AnswerverifiedShow Answer

When acetylcholine binds to receptors at the motor end plate, the sarcolemma becomes

Correct AnswerverifiedShow Answer

The structural theory that explains how a muscle fiber contracts is called the ________ theory.

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
The action potential triggers the exocyt...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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