Question 1

A single motor neuron together with all the muscle fibers it innervates is called

Accepted Answer

A)   an end foot.
B)   an end plate.
C)   a motor unit.
D)   a dermatome.
E)   a myotome.F) All of the above
G) B) and D)

Question 2

Since each myofibril is attached at either end of the muscle fiber, when sarcomeres shorten, the muscle fiber

Accepted Answer

A)   lengthens.
B)   shortens.
C)   strengthens.
D)   weakens.
E)   not enough information to sayF) A) and B)
G) C) and D) B

Question 3

Aerobic metabolism normally provides ________ percent of the ATP demands of a resting muscle cell.

Accepted Answer

A)   25
B)   50
C)   70
D)   95
E)   100F) B) and D)
G) None of the above

Question 4

Figure 9-1 Skeletal Muscle Fiber
Use Figure 9-1 to answer the following questions:
-Which structure actively pumps calcium ions out of the sarcoplasm to produce relaxation?

Accepted Answer

A)   6
B)   7
C)   1
D)   3
E)   2F) C) and D)
G) A) and B)

Question 5

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) D) and E)
G) C) and D)

Question 6

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) A) and B)
G) C) and E)

Question 7

The advantage of having many nuclei in a skeletal muscle fiber is

Accepted Answer

A)   the ability to contract.
B)   the ability to produce more ATP with little oxygen.
C)   the ability to store extra DNA for metabolism.
D)   the ability to produce large amounts of the muscle proteins needed for muscle contraction.
E)   all of the aboveF) A) and E)
G) A) and D)

Question 8

Each skeletal muscle fiber is controlled by a motor neuron at a single

Accepted Answer

A)   synaptic knob.
B)   sarcomere.
C)   neuromuscular junction.
D)   synaptic cleft.
E)   transverse tubule.F) A) and C)
G) A) and E) C

Question 9

Synaptic vesicles containing neurotransmitters are released by ________ when the action potential arrives.

Accepted Answer

A)   endocytosis
B)   apoptosis
C)   exocytosis
D)   hydrolysis
E)   sodiumF) D) and E)
G) A) and D)

Question 10

The increase in muscle tension that is produced by increasing the number of active motor units is called

Accepted Answer

A)   incomplete tetanus.
B)   complete tetanus.
C)   treppe.
D)   wave summation.
E)   recruitment.F) All of the above
G) B) and E)

Question 11

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 spastic paralysis (muscles are contracted and unable to relax) .
D)   It would cause flaccid paralysis (muscles are relaxed and unable to contract) .
E)   It would have little effect on skeletal muscles.F) A) and E)
G) B) and E)

Question 12

What is thought to happen in a muscle during the response shown in graph (a) ?

Accepted Answer

A)   It is getting stronger with exercise.
B)   There is a gradual increase in the concentration of calcium ions in the sarcoplasm.
C)   It is fatigued and must make repeated efforts to twitch normally.
D)   It is aged and has lost contractile proteins.
E)   It is producing more ATP as tension increases.F) B) and E)
G) D) and E)

Question 13

Figure 9-1 Skeletal Muscle Fiber
Use Figure 9-1 to answer the following questions:
-Where are the myosin molecules located?

Accepted Answer

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

Question 14

Figure 9-1 Skeletal Muscle Fiber
Use Figure 9-1 to answer the following questions:
-What physiological process occurs in the structure labeled "7"?

Accepted Answer

A)   release of neurotransmitter
B)   conduction of the action potential into the cell interior
C)   activity of acetylcholinesterase
D)   release of protein into the muscle fiber
E)   the sliding filament theoryF) All of the above
G) A) and B)

Question 15

Figure 9-1 Skeletal Muscle Fiber
Use Figure 9-1 to answer the following questions:
-Which of the following are found in the structure labeled "3"?

Accepted Answer

A)   actin
B)   myosin
C)   titin
D)   tropomyosin
E)   all of the aboveF) A) and D)
G) A) and C) E

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) B) and C)

Question 17

At each end of the muscle, the collagen fibers of the epimysium, and each perimysium and endomysium, come together to form a

Accepted Answer

A)   tendon.
B)   satellite cell.
C)   ligament.
D)   tenosynovium.
E)   sheath.F) A) and B)
G) A) and C)

Question 18

When a skeletal muscle fiber contracts,

Accepted Answer

A)   the H bands and I bands get smaller.
B)   the zones of overlap get larger.
C)   the Z lines get closer together.
D)   the width of the A band remains constant.
E)   all of the aboveF) B) and C)
G) All of the above

Question 19

Skeletal muscle fibers are formed from embryonic cells called

Accepted Answer

A)   sarcomeres.
B)   myofibrils.
C)   myoblasts.
D)   fascicles.
E)   myomeres.F) B) and E)
G) A) and E)

Question 20

________ are stem cells located between the endomysium and sarcolemma that function in the repair of damaged muscle tissue.

Accepted Answer

The answer of ________ are stem cells located between the...

Exam 9: Skeletal Muscle Tissue

A single motor neuron together with all the muscle fibers it innervates is called

Correct AnswerverifiedShow Answer

Since each myofibril is attached at either end of the muscle fiber, when sarcomeres shorten, the muscle fiber

Correct AnswerverifiedB

Aerobic metabolism normally provides ________ percent of the ATP demands of a resting muscle cell.

Correct AnswerverifiedShow Answer

Figure 9-1 Skeletal Muscle Fiber Use Figure 9-1 to answer the following questions: -Which structure actively pumps calcium ions out of the sarcoplasm to produce relaxation?

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

The advantage of having many nuclei in a skeletal muscle fiber is

Correct AnswerverifiedShow Answer

Each skeletal muscle fiber is controlled by a motor neuron at a single

Correct AnswerverifiedC

Synaptic vesicles containing neurotransmitters are released by ________ when the action potential arrives.

Correct AnswerverifiedShow Answer

The increase in muscle tension that is produced by increasing the number of active motor units is called

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

What is thought to happen in a muscle during the response shown in graph (a) ?

Correct AnswerverifiedShow Answer

Figure 9-1 Skeletal Muscle Fiber Use Figure 9-1 to answer the following questions: -Where are the myosin molecules located?

Correct AnswerverifiedShow Answer

Figure 9-1 Skeletal Muscle Fiber Use Figure 9-1 to answer the following questions: -What physiological process occurs in the structure labeled "7"?

Correct AnswerverifiedShow Answer

Figure 9-1 Skeletal Muscle Fiber Use Figure 9-1 to answer the following questions: -Which of the following are found in the structure labeled "3"?

Correct AnswerverifiedE

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

At each end of the muscle, the collagen fibers of the epimysium, and each perimysium and endomysium, come together to form a

Correct AnswerverifiedShow Answer

When a skeletal muscle fiber contracts,

Correct AnswerverifiedShow Answer

Skeletal muscle fibers are formed from embryonic cells called

Correct AnswerverifiedShow Answer

________ are stem cells located between the endomysium and sarcolemma that function in the repair of damaged muscle tissue.

Correct AnswerverifiedShow Answer

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E

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