Question 1

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) C) and D)

Question 2

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 E)
G) A) and C)

Question 3

In an isotonic contraction,

Accepted Answer

A)   muscle tension exceeds the load and the muscle lifts the load.
B)   tension rises and falls but the muscle length is constant.
C)   the peak tension is less than the load.
D)   many twitches always fuse into one.
E)   postural muscles stabilize the vertebrae.F) A) and C)
G) C) and D)

Question 4

The type of muscle fiber that is most resistant to fatigue is the ________ fiber.

Accepted Answer

A)   fast
B)   slow
C)   intermediate
D)   anaerobic
E)   high-densityF) A) and B)
G) All of the above

Question 5

Which of the following best describes the term sarcomere?

Accepted Answer

A)   protein that accounts for elasticity of resting muscle
B)   repeating unit of striated myofibrils
C)   storage site for calcium ions
D)   thin filaments are anchored here
E)   largely made of myosin moleculesF) B) and C)
G) B) and D)

Question 6

Detachment of myosin cross-bridges occurs during the

Accepted Answer

A)   contraction phase.
B)   relaxation phase.
C)   stimulus phase.
D)   latent period.
E)   isotonic period.F) C) and D)
G) D) and E)

Question 7

The type of contraction where the tension exceeds the load is called

Accepted Answer

A)   isometric contraction.
B)   isotonic eccentric contraction.
C)   isotonic concentric contraction.
D)   isometric concentric contraction.
E)   isometric eccentric contraction.F) C) and E)
G) C) and D)

Question 8

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

Accepted Answer

A)   isometric
B)   tetanus
C)   isotonic
D)   treppe
E)   concentricF) A) and C)
G) A) and E)

Question 9

Which of the following types of muscle fibers are best adapted for prolonged contraction such as standingall day?

Accepted Answer

A)   uninucleated fibers
B)   striated fibers
C)   fast fibers
D)   slow fibers
E)   intermediate fibersF) A) and E)
G) A) and D)

Question 10

Megan wants to enter a weight-lifting competition and consults you as to what type of muscle fibers she needs to develop and how she should go about it. What would you suggest to her?

Accepted Answer

Weight lifting requires anaerobic endura...

Question 11

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

Question 12

The bundle of collagen fibers at the end of a skeletal muscle that attaches the muscle to bone is calleda(n)

Accepted Answer

A)   fascicle.
B)   tendon.
C)   ligament.
D)   epimysium.
E)   myofibril.F) D) and E)
G) C) and D)

Question 13

Put the following events of the contraction cycle in the order in which they occur.
1)  Cross-bridge detachment
2)  Cross-bridge formation
3)  Active site exposure
4)  Myosin reactivation
5)  Calcium ions bind troponin
6)  Myosin head pivoting

Accepted Answer

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

Question 14

At what point during excitation contraction coupling does exocytosis play a role?

Accepted Answer

A)   during calcium ion reuptake into the sarcoplasmic reticulum
B)   when sodium channels open up on the motor end plate
C)   during acetylcholine release from the synaptic terminal
D)   when the action potential surges through the T-tubules
E)   when ATP splits into ADP and P on the free myosin headF) A) and D)
G) A) and C)

Question 15

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

Accepted Answer

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

Question 16

Which of the following best describes the term sarcoplasmic reticulum?

Accepted Answer

A)   protein that accounts for elasticity of resting muscle
B)   repeating unit of striated myofibrils
C)   storage and release site for calcium ions
D)   thin filaments are anchored here
E)   largely made of myosin moleculesF) A) and D)
G) A) and C)

Question 17

During the time when the action potential moves through the sarcolemma a muscle twitch is in

Accepted Answer

A)   contraction phase.
B)   relaxation phase.
C)   stimulus phase.
D)   latent period.
E)   isotonic period.F) All of the above
G) B) and E)

Exam 10: Muscle Tissue

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

Correct Answer
verified

Megan wants to enter a weight-lifting competition and consults you as to what type of muscle fibers she needs to develop and how she should go about it. What would you suggest to her?

Correct Answer
verified
Weight lifting requires anaerobic endura...
View Answer

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

Correct Answer
verified

In an isotonic contraction,

Correct Answer
verified

The bundle of collagen fibers at the end of a skeletal muscle that attaches the muscle to bone is calleda(n)

Correct Answer
verified

The type of muscle fiber that is most resistant to fatigue is the ________ fiber.

Correct Answer
verified

Detachment of myosin cross-bridges occurs during the

Correct Answer
verified

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

Correct Answer
verified

At what point during excitation contraction coupling does exocytosis play a role?

Correct Answer
verified

Which of the following best describes the term sarcoplasmic reticulum?

Correct Answer
verified

The type of contraction where the tension exceeds the load is called

Correct Answer
verified

Which of the following best describes the term sarcomere?

Correct Answer
verified

Which of the following types of muscle fibers are best adapted for prolonged contraction such as standingall day?

Correct Answer
verified

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

Correct Answer
verified

Put the following events of the contraction cycle in the order in which they occur. 1) Cross-bridge detachment 2) Cross-bridge formation 3) Active site exposure 4) Myosin reactivation 5) Calcium ions bind troponin 6) Myosin head pivoting

Correct Answer
verified

When a skeletal muscle fiber contracts, the

Correct Answer
verified

During the time when the action potential moves through the sarcolemma a muscle twitch is in

Correct Answer
verified

Exam 10: Muscle Tissue

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

Correct AnswerverifiedShow Answer

Megan wants to enter a weight-lifting competition and consults you as to what type of muscle fibers she needs to develop and how she should go about it. What would you suggest to her?

Correct AnswerverifiedWeight lifting requires anaerobic endura...View AnswerShow Answer

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

Correct AnswerverifiedShow Answer

In an isotonic contraction,

Correct AnswerverifiedShow Answer

The bundle of collagen fibers at the end of a skeletal muscle that attaches the muscle to bone is calleda(n)

Correct AnswerverifiedShow Answer

The type of muscle fiber that is most resistant to fatigue is the ________ fiber.

Correct AnswerverifiedShow Answer

Detachment of myosin cross-bridges occurs during the

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

At what point during excitation contraction coupling does exocytosis play a role?

Correct AnswerverifiedShow Answer

Which of the following best describes the term sarcoplasmic reticulum?

Correct AnswerverifiedShow Answer

The type of contraction where the tension exceeds the load is called

Correct AnswerverifiedShow Answer

Which of the following best describes the term sarcomere?

Correct AnswerverifiedShow Answer

Which of the following types of muscle fibers are best adapted for prolonged contraction such as standingall day?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Put the following events of the contraction cycle in the order in which they occur. 1) Cross-bridge detachment 2) Cross-bridge formation 3) Active site exposure 4) Myosin reactivation 5) Calcium ions bind troponin 6) Myosin head pivoting

Correct AnswerverifiedShow Answer

When a skeletal muscle fiber contracts, the

Correct AnswerverifiedShow Answer

During the time when the action potential moves through the sarcolemma a muscle twitch is in

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified
Weight lifting requires anaerobic endura...
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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