Question 1

The protein that is found in the Z line of a sarcomere is called ________.

Accepted Answer

The answer of The protein that is found in the...

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)  pulls from the middle.F) C) and E)
G) A) and E)

Question 3

Skeletal muscle fibers are formed from embryonic cells called

Accepted Answer

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

Question 4

The repeating unit of a skeletal muscle fiber is the

Accepted Answer

A)  sarcolemma.
B)  sarcomere.
C)  sarcoplasmic reticulum.
D)  myofibril.
E)  myofilament.F) A) and B)
G) A) and C)

Question 5

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

Question 6

Figure 10-1 Skeletal Muscle Fiber
Use Figure 10-1 to answer the following question:
-Where would calcium ions be predominately found?

Accepted Answer

A)  1
B)  2
C)  4
D)  8
E)  9F) All of the above
G) A) and D)

Question 7

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 8

At peak levels of muscle exertion the mitochondria can supply

Accepted Answer

A)  all of the energy required by the muscle.
B)  80 percent of the energy required by the muscle.
C)  more than half of the energy required by the muscle.
D)  only about one-third of the energy required by the muscle.
E)  only about 10 percent of the energy required by the muscle.F) A) and B)
G) None of the above

Question 9

When a muscle is stimulated repeatedly at a high rate,the amount of tension gradually increases to a steady maximum tension.This is called

Accepted Answer

A)  incomplete tetanus.
B)  complete tetanus.
C)  a twitch.
D)  wave summation.
E)  recruitment.F) A) and E)
G) A) and B)

Question 10

The thin filaments of striated muscle are made primarily of which protein(s) ?

Accepted Answer

A)  actin
B)  tropomyosin
C)  troponin
D)  nebulin
E)  All of the answers are correct.F) A) and E)
G) A) and B)

Question 11

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) All of the above
G) None of the above

Question 12

Each thin filament consists of

Accepted Answer

A)  two actin protein strands coiled helically around each other.
B)  chains of myosin molecules.
C)  six molecules coiled into a helical structure.
D)  a rod-shaped structure with "heads" projecting from each end.
E)  a double strand of myosin molecules.F) C) and E)
G) A) and B)

Question 13

Figure 10-1 Skeletal Muscle Fiber
Use Figure 10-1 to answer the following question:
-Identify the structure labeled "1."

Accepted Answer

A)  mitochondria
B)  glycogen
C)  ATP
D)  myofibril
E)  synaptic vesicleF) All of the above
G) D) and E)

Question 14

In which of the following would the motor units have the fewest muscle fibers?

Accepted Answer

A)  muscles of the neck
B)  postural muscles of the back
C)  muscles that control the eyes
D)  thigh muscles
E)  calf musclesF) All of the above
G) A) and B)

Question 15

The type of contraction in which the muscle fibers do not shorten is called

Accepted Answer

A)  tetany.
B)  treppe.
C)  concentric.
D)  isotonic.
E)  isometric.F) C) and D)
G) A) and D)

Question 16

Which of the following is not a function of smooth muscle tissue?

Accepted Answer

A)  altering the diameter of the respiratory passageways
B)  elevating hairs on the arm
C)  forcing blood from the heart into the major arteries
D)  moving food materials along the digestive tract
E)  forcing urine out of the urinary tractF) All of the above
G) B) and C)

Question 17

Which of the following hormones directly stimulates growth of muscle tissue,leading to increased muscle mass?

Accepted Answer

A)  epinephrine
B)  thyroid hormone
C)  testosterone
D)  parathyroid hormone
E)  calcitoninF) A) and C)
G) B) and E)

Question 18

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) C) and D)
G) A) and D)

Question 19

The delicate connective tissue that surrounds the skeletal muscle fibers and ties adjacent muscle fibers together is the

Accepted Answer

A)  endomysium.
B)  perimysium.
C)  epimysium.
D)  superficial fascia.
E)  periosteum.F) A) and D)
G) A) and E)

Question 20

Figure 10-1 Skeletal Muscle Fiber
Use Figure 10-1 to answer the following question:
-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) A) and D)
G) A) and C)

Exam 10: Muscle Tissue

Which of the following is not a function of smooth muscle tissue?

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Skeletal muscle fibers are formed from embryonic cells called

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The protein that is found in the Z line of a sarcomere is called ________.

Correct AnswerverifiedShow Answer

Which of the following hormones directly stimulates growth of muscle tissue,leading to increased muscle mass?

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

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

At peak levels of muscle exertion the mitochondria can supply

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

The type of contraction in which the muscle fibers do not shorten is called

Correct AnswerverifiedShow Answer

The repeating unit of a skeletal muscle fiber is the

Correct AnswerverifiedShow Answer

The thin filaments of striated muscle are made primarily of which protein(s) ?

Correct AnswerverifiedShow Answer

When a muscle is stimulated repeatedly at a high rate,the amount of tension gradually increases to a steady maximum tension.This is called

Correct AnswerverifiedShow Answer

Each thin filament consists of

Correct AnswerverifiedShow Answer

Figure 10-1 Skeletal Muscle Fiber Use Figure 10-1 to answer the following question: -What physiological process occurs in the structure labeled "7"?

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The delicate connective tissue that surrounds the skeletal muscle fibers and ties adjacent muscle fibers together is the

Correct AnswerverifiedShow Answer

Figure 10-1 Skeletal Muscle Fiber Use Figure 10-1 to answer the following question: -Where would calcium ions be predominately found?

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In which of the following would the motor units have the fewest muscle fibers?

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Figure 10-1 Skeletal Muscle Fiber Use Figure 10-1 to answer the following question: -Identify the structure labeled "1."

Correct AnswerverifiedShow Answer

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The action potential triggers the exocyt...
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