Question 1

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) All of the above

Question 2

Which of the following would not lead to increased oxygen consumption?

Accepted Answer

A)  increased heat production
B)  increased conversion of lactic acid to glucose
C)  increased anaerobic respiration by muscle cells
D)  increased muscle activity
E)  All of the answers are correct; none would lead to increased oxygen consumption.F) C) and E)
G) C) and D)

Question 3

After heavy exercise,if energy reserves in a muscle are depleted,________ occurs.

Accepted Answer

A)  an oxygen debt
B)  paralysis
C)  treppe
D)  tetanus
E)  atrophyF) A) and E)
G) C) and E)

Question 4

A resting muscle generates most of its ATP by

Accepted Answer

A)  hydrolysis of creatine phosphate.
B)  anaerobic respiration.
C)  aerobic metabolism of fatty acids.
D)  glycogenolysis.
E)  the tricarboxylic acid cycle.F) A) and E)
G) B) and C)

Question 5

Figure 10-2 Muscle Contractions
Use Figure 10-2 to answer the following questions:
-Why is there partial relaxation in graph (c) ?

Accepted Answer

A)  Calcium ion release is slow.
B)  The muscle is starting to fatigue.
C)  Stimulation intensity is fluctuating.
D)  ATP reserves are cycling.
E)  Nerve stimulation frequency is below maximum.F) A) and D)
G) C) and D)

Question 6

Muscles that move the eyeball have ________ fibers.

Accepted Answer

A)  fast
B)  slow
C)  intermediate
D)  circular
E)  All of the answers are correct.F) C) and D)
G) A) and C)

Question 7

Nerves and blood vessels that service a muscle fiber are located in the connective tissues of its

Accepted Answer

A)  endomysium.
B)  perimysium.
C)  sarcolemma.
D)  sarcomere.
E)  myofibrils.F) None of the above
G) A) and E)

Question 8

Figure 10-1 Skeletal Muscle Fiber
Use Figure 10-1 to answer the following questions:
-Which structure has pumps to remove calcium ions from the sarcoplasm to produce relaxation?

Accepted Answer

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

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

Question 10

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

Question 11

Which of the following acts as an ATPase during the contraction cycle of muscle?

Accepted Answer

A)  actin molecules
B)  troponin molecules
C)  tropomyosin molecules
D)  the head portion of the myosin molecule
E)  the tail portion of the myosin moleculeF) B) and C)
G) A) and B)

Question 12

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 E)
G) C) and D)

Question 13

A weight-lifter strains to lift a heavy weight and there is no movement of the person's arms holding on to the weight.This type of contraction is called a(n) ________ contraction.

Accepted Answer

A)  isometric
B)  tetanus
C)  isotonic
D)  treppe
E)  concentricF) B) and D)
G) All of the above

Question 14

Physical evidence that supports the sliding filament theory of muscle contraction includes

Accepted Answer

A)  constant distance between Z lines during contraction.
B)  decreased width of the H band during contraction.
C)  increased width of the I band during contraction.
D)  decreased width of the A band during contraction.
E)  the I band + H band distance is constant during contraction.F) A) and C)
G) A) and E)

Question 15

When calcium ion binds to troponin,

Accepted Answer

A)  tropomyosin rolls away from the active site.
B)  active sites on the myosin are exposed.
C)  actin heads will bind to myosin.
D)  muscle relaxation occurs.
E)  myosin shortens.F) B) and E)
G) A) and D)

Question 16

When a skeletal muscle fiber contracts,the

Accepted Answer

A)  H bands and I bands get larger.
B)  zones of overlap get larger.
C)  Z lines move further apart.
D)  width of the A band increases.
E)  All of the answers are correct.F) A) and B)
G) B) and E)

Question 17

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

Accepted Answer

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

Question 18

Communication between axons and muscle fibers occurs at specialized synapses called

Accepted Answer

A)  nervous units.
B)  synaptic terminals.
C)  motor end plates.
D)  motor units.
E)  neuromuscular junctions.F) A) and E)
G) A) and D)

Question 19

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) A) and B)
G) None of the above

Question 20

Muscle fibers differ from "typical cells" in that muscle fibers

Accepted Answer

A)  lack a plasma membrane.
B)  have many nuclei.
C)  are very small.
D)  lack mitochondria.
E)  have large gaps in the cell membrane.F) C) and D)
G) None of the above

Exam 10: Muscle Tissue

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

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Muscle fibers differ from "typical cells" in that muscle fibers

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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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When a skeletal muscle fiber contracts,the

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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

Which of the following would not lead to increased oxygen consumption?

Correct AnswerverifiedShow Answer

Figure 10-2 Muscle Contractions Use Figure 10-2 to answer the following questions: -Why is there partial relaxation in graph (c) ?

Correct AnswerverifiedShow Answer

After heavy exercise,if energy reserves in a muscle are depleted,________ occurs.

Correct AnswerverifiedShow Answer

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

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

A weight-lifter strains to lift a heavy weight and there is no movement of the person's arms holding on to the weight.This type of contraction is called a(n) ________ contraction.

Correct AnswerverifiedShow Answer

Nerves and blood vessels that service a muscle fiber are located in the connective tissues of its

Correct AnswerverifiedShow Answer

A resting muscle generates most of its ATP by

Correct AnswerverifiedShow Answer

Physical evidence that supports the sliding filament theory of muscle contraction includes

Correct AnswerverifiedShow Answer

When calcium ion binds to troponin,

Correct AnswerverifiedShow Answer

Communication between axons and muscle fibers occurs at specialized synapses called

Correct AnswerverifiedShow Answer

Which of the following acts as an ATPase during the contraction cycle of muscle?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Muscles that move the eyeball have ________ fibers.

Correct AnswerverifiedShow Answer

Figure 10-1 Skeletal Muscle Fiber Use Figure 10-1 to answer the following questions: -Which structure has pumps to remove calcium ions from the sarcoplasm to produce relaxation?

Correct AnswerverifiedShow Answer

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