Question 1

A single motor neuron together with all the muscle fibers it innervates is called a(n)

Accepted Answer

A)   end foot.
B)   end plate.
C)   motor unit.
D)   dermatome.
E)   myotome.F) A) and E)
G) A) and B)

Question 2

Muscle tissue, one of the four basic tissue groups, consists chiefly of cells that are highly specializedfor

Accepted Answer

A)   conduction.
B)   contraction.
C)   peristalsis.
D)   cushioning.
E)   secretion.F) B) and C)
G) A) and E)

Question 3

At rest, the tropomyosin molecule is held in place by

Accepted Answer

A)   actin molecules.
B)   myosin molecules.
C)   troponin molecules.
D)   ATP molecules.
E)   calcium ions.F) C) and E)
G) A) and D)

Question 4

Triggering of the muscle action potential occurs after

Accepted Answer

A)   acetylcholine binds to chemically-gated channels in the motor end plate.
B)   acetylcholinesterase is released from synaptic vesicles into the synaptic cleft.
C)   calcium ion binds to channels on the motor end plate.
D)   the action potential jumps across the neuromuscular junction.
E)   Any of these can produce an action potential in the muscle cell.F) A) and E)
G) C) and D)

Question 5

In response to action potentials arriving along the transverse tubules, the sarcoplasmic reticulum releases

Accepted Answer

A)   acetylcholine.
B)   sodium ions.
C)   potassium ions.
D)   calcium ions.
E)   hydrogen ions.F) B) and E)
G) A) and D)

Question 6

Which of the following is not an effect of aging on the muscular system?

Accepted Answer

A)   hypertrophy
B)   smaller muscle fibers
C)   decreased recovery from muscle injuries
D)   exercise tolerance decreases
E)   muscles become less elasticF) A) and B)
G) B) and D)

Question 7

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

Question 8

Large-diameter, densely packed myofibrils, large glycogen reserves, and few mitochondria are characteristics of

Accepted Answer

A)   slow fibers.
B)   intermediate fibers.
C)   fast fibers.
D)   red muscles.
E)   fatty muscles.F) A) and B)
G) None of the above

Question 9

Afascicle is a

Accepted Answer

A)   group of muscle fibers that are encased in the perimysium.
B)   layer of connective tissue that separates muscle from skin.
C)   group of muscle fibers that are all part of the same motor unit.
D)   group of muscle fibers and motor neurons.
E)   collection of myofibrils in a muscle fiber.F) All of the above
G) C) and E)

Question 10

The skeletal muscle complex known as the triad consists of

Accepted Answer

A)   actin, myosin, and titin filaments.
B)   a transverse tubule and two terminal cisternae.
C)   filaments, myofibrils, and sarcomeres.
D)   A bands, H bands, and I bands.
E)   actin, myosin, and sarcomeres.F) A) and B)
G) A) and E)

Question 11

A single contraction-relaxation cycle in a muscle fiber produces a(n)

Accepted Answer

A)   cramp.
B)   twitch.
C)   tetanic contraction.
D)   action potential.
E)   motor unit.F) A) and E)
G) A) and B)

Question 12

Figure 10-2 Muscle Contractions
 
Use Figure 10-2 to answer the following questions:
-What is thought to happen in a muscle during the response shown in graph (a) ?

Accepted Answer

A)   It is strengthening with exercise.
B)   There is a gradual increase in calcium ion concentration 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) A) and B)
G) A) and E)

Question 13

Skeletal muscle fibers are formed from embryonic cells called

Accepted Answer

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

Question 14

Which of the following statements is/are false regarding human muscles?

Accepted Answer

A)   Most have both slow and fast fibers.
B)   Slow fibers are abundant in the muscles of the hand.
C)   Eye muscles are composed entirely of fast fibers.
D)   Slow fibers are abundant in the back muscles.
E)   All of the answers are correct; none of them are true regarding human muscles.F) D) and E)
G) B) and C)

Question 15

In-Text Figure Based Questions
-Which skeletal muscle fiber type-slow or fast-contains more mitochondria? (Figure 10-21)

Accepted Answer

A)   slow
B)   fastC) A) and B)
D) undefined

Question 16

The region of the sarcomere containing the thick filaments is the

Accepted Answer

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

Question 17

At rest, active sites on the actin are blocked by

Accepted Answer

A)   myosin molecules.
B)   troponin molecules.
C)   tropomyosin molecules.
D)   calcium ions.
E)   ATP molecules.F) B) and C)
G) A) and E)

Question 18

How would an elevated level of thyroid hormone in the body affect skeletal muscles?

Accepted Answer

A)   It would stimulate atrophy.
B)   It would stimulate hypertrophy.
C)   It would stimulate energy use and heat production.
D)   It would decrease heat production by muscle tissue.
E)   It would cause an increase in muscle mass.F) A) and D)
G) B) and D)

Question 19

Which of the following is true about the difference between cardiac muscle cells and skeletal muscle cells?

Accepted Answer

A)   Cardiac muscle cells does not have striations like skeletal muscle cells.
B)   Cardiac muscle cells does not have t-tubules.
C)   Cardiac muscle cells does not have sarcomeres.
D)   Cardiac muscle cells have intercalated discs where skeletal muscle cells do not.
E)   Cardiac muscle cells have more nuclei in them than skeletal muscle cells.F) A) and E)
G) A) and B)

Question 20

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

Accepted Answer

A)   contract much more forcefully.
B)   produce more ATP with little oxygen.
C)   store extra DNA for metabolism.
D)   produce large amounts of muscle proteins.
E)   produce nutrients for muscle contraction.F) A) and D)
G) D) and E)

Exam 10: Muscle Tissue

Which of the following statements is/are false regarding human muscles?

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The skeletal muscle complex known as the triad consists of

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At rest, the tropomyosin molecule is held in place by

Correct AnswerverifiedShow Answer

Large-diameter, densely packed myofibrils, large glycogen reserves, and few mitochondria are characteristics of

Correct AnswerverifiedShow Answer

Which of the following is true about the difference between cardiac muscle cells and skeletal muscle cells?

Correct AnswerverifiedShow Answer

In-Text Figure Based Questions -Which skeletal muscle fiber type-slow or fast-contains more mitochondria? (Figure 10-21)

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Afascicle is a

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How would an elevated level of thyroid hormone in the body affect skeletal muscles?

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

Correct AnswerverifiedShow Answer

The region of the sarcomere containing the thick filaments is the

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

In response to action potentials arriving along the transverse tubules, the sarcoplasmic reticulum releases

Correct AnswerverifiedShow Answer

Skeletal muscle fibers are formed from embryonic cells called

Correct AnswerverifiedShow Answer

Muscle tissue, one of the four basic tissue groups, consists chiefly of cells that are highly specializedfor

Correct AnswerverifiedShow Answer

A single contraction-relaxation cycle in a muscle fiber produces a(n)

Correct AnswerverifiedShow Answer

Figure 10-2 Muscle Contractions Use Figure 10-2 to answer the following questions: -What is thought to happen in a muscle during the response shown in graph (a) ?

Correct AnswerverifiedShow Answer

At rest, active sites on the actin are blocked by

Correct AnswerverifiedShow Answer

A single motor neuron together with all the muscle fibers it innervates is called a(n)

Correct AnswerverifiedShow Answer

Which of the following is not an effect of aging on the muscular system?

Correct AnswerverifiedShow Answer

Triggering of the muscle action potential occurs after

Correct AnswerverifiedShow Answer

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