Question 1

Three discrete types of muscle fibers are identified on the basis of their size, speed, and endurance. Which of the following athletic endeavors best represents the use of red fibers?

Accepted Answer

A)   gym climbing
B)   a long, relaxing swim
C)   playing baseball or basketball
D)   a sprint by an Olympic runnerE) All of the above
F) C) and D)

Question 2

What does excess postexercise oxygen consumption represent?

Accepted Answer

A)   the difference between the amount of oxygen needed for totally aerobic muscle activity and the amount actually used
B)   amount of oxygen needed for aerobic activity to accomplish the same amount of work
C)   the amount of oxygen equal to the oxygen already used
D)   the amount of oxygen taken into the body immediately after the exertionE) All of the above
F) A) and C)

Question 3

Briefly, what causes rigor mortis?

Accepted Answer

Following the death of an individual, AT...

Question 4

What are caveolae?

Accepted Answer

Folds on the surface...

Question 5

Which of the choices below does not describe how excess postexercise oxygen consumption (oxygen deficit)  restores metabolic conditions?

Accepted Answer

A)   replaces the oxygen removed from myoglobin
B)   converts lactic acid back into glycogen stores in the liver
C)   resynthesizes creatine phosphate and ATP in muscle fibers
D)   increases the level of lactic acid in the muscleE) A) and D)
F) A) and B)

Question 6

What is the primary function of wave summation?

Accepted Answer

A)   produce smooth, continuous muscle contraction
B)   prevent muscle fatigue
C)   prevent muscle relaxation
D)   increase muscle tensionE) All of the above
F) A) and B)

Question 7

How is it that norepinephrine (NE) can inhibit smooth muscle action in airways, yet stimulate contractions in smooth muscles everywhere else in the body?

Accepted Answer

Norepinephrine's effects depen...

Question 8

Which of the following is not a role of ionic calcium in muscle contraction?

Accepted Answer

A)   activates epinephrine released from adrenal gland
B)   triggers neurotransmitter secretion
C)   removes contraction inhibitor
D)   binds with troponinE) A) and B)
F) A) and C)

Question 9

What produces the striations of a skeletal muscle cell?

Accepted Answer

A)   a difference in the thickness of the sarcolemma
B)   the T tubules
C)   the sarcoplasmic reticulum
D)   the arrangement of myofilamentsE) A) and C)
F) All of the above

Question 10

When a muscle is unable to respond to stimuli temporarily, it is in which of the following periods?

Accepted Answer

A)   relaxation period
B)   latent period
C)   refractory period
D)   fatigue periodE) A) and B)
F) A) and C)

Question 11

What structure in skeletal muscle cells functions in calcium storage?

Accepted Answer

A)   myofibrillar network
B)   mitochondria
C)   intermediate filament network
D)   sarcoplasmic reticulumE) A) and B)
F) A) and C)

Question 12

What part of the sarcolemma contains acetylcholine receptors?

Accepted Answer

A)   end of the muscle fiber
B)   motor end plate
C)   part adjacent to another muscle cell
D)   any part of the sarcolemmaE) None of the above
F) B) and D)

Question 13

The thin filaments (actin) contain a polypeptide subunit G actin that bears active sites for myosin attachment.

Accepted Answer

A) True 
 B)False

Question 14

The nurse encourages the patient to do his own activities of daily living such as bathing, eating, dressing, and toileting activities. How do these activities promote physical conditioning?

Accepted Answer

These activities are isotonic exercises ...

Question 15

Peristalsis is characteristic of smooth muscle.

Accepted Answer

A) True 
 B)False

Question 16

What is the role of calcium ions in muscle contraction?

Accepted Answer

A)   increase levels of myoglobin
B)   reestablish glycogen stores
C)   bind to regulatory sites on troponin to remove contraction inhibition
D)   form hydroxyapatite crystalsE) A) and B)
F) All of the above

Question 17

Aaron arrived at the hospital with the following symptoms: drooping eyelids; fatigue and weakness of his muscles; and difficulty talking, breathing, and swallowing. What was his diagnosis?

Accepted Answer

Aaron probably has myasthenia ...

Question 18

Briefly explain the sources of energy for a one- minute sustained muscle contraction.

Accepted Answer

1. The first 4- 6 seconds of energy come...

Question 19

Which of the following is a factor that affects the velocity and duration of muscle contraction?

Accepted Answer

A)   load on the fiber
B)   number of muscle fibers stimulated
C)   size of the muscle fibers stimulated
D)   muscle lengthE) C) and D)
F) A) and B)

Question 20

Myoglobin _.

Accepted Answer

A)   is a protein involved in the direct phosphorylation of ADP
B)   stores oxygen in muscle cells
C)   produces the end plate potential
D)   breaks down glycogenE) A) and B)
F) C) and D)

Exam 9: Muscles and Muscle Tissue

When a muscle is unable to respond to stimuli temporarily, it is in which of the following periods?

Correct AnswerverifiedShow Answer

Myoglobin _.

Correct AnswerverifiedShow Answer

Aaron arrived at the hospital with the following symptoms: drooping eyelids; fatigue and weakness of his muscles; and difficulty talking, breathing, and swallowing. What was his diagnosis?

Correct AnswerverifiedAaron probably has myasthenia ...View AnswerShow Answer

The nurse encourages the patient to do his own activities of daily living such as bathing, eating, dressing, and toileting activities. How do these activities promote physical conditioning?

Correct AnswerverifiedThese activities are isotonic exercises ...View AnswerShow Answer

Three discrete types of muscle fibers are identified on the basis of their size, speed, and endurance. Which of the following athletic endeavors best represents the use of red fibers?

Correct AnswerverifiedShow Answer

What is the role of calcium ions in muscle contraction?

Correct AnswerverifiedShow Answer

Which of the following is a factor that affects the velocity and duration of muscle contraction?

Correct AnswerverifiedShow Answer

What does excess postexercise oxygen consumption represent?

Correct AnswerverifiedShow Answer

How is it that norepinephrine (NE) can inhibit smooth muscle action in airways, yet stimulate contractions in smooth muscles everywhere else in the body?

Correct AnswerverifiedNorepinephrine's effects depen...View AnswerShow Answer

Peristalsis is characteristic of smooth muscle.

Correct AnswerverifiedShow Answer

What is the primary function of wave summation?

Correct AnswerverifiedShow Answer

Briefly, what causes rigor mortis?

Correct AnswerverifiedFollowing the death of an individual, AT...View AnswerShow Answer

What produces the striations of a skeletal muscle cell?

Correct AnswerverifiedShow Answer

What part of the sarcolemma contains acetylcholine receptors?

Correct AnswerverifiedShow Answer

Briefly explain the sources of energy for a one- minute sustained muscle contraction.

Correct Answerverified1. The first 4- 6 seconds of energy come...View AnswerShow Answer

Which of the choices below does not describe how excess postexercise oxygen consumption (oxygen deficit) restores metabolic conditions?

Correct AnswerverifiedShow Answer

What are caveolae?

Correct AnswerverifiedFolds on the surface...View AnswerShow Answer

What structure in skeletal muscle cells functions in calcium storage?

Correct AnswerverifiedShow Answer

The thin filaments (actin) contain a polypeptide subunit G actin that bears active sites for myosin attachment.

Correct AnswerverifiedShow Answer

Which of the following is not a role of ionic calcium in muscle contraction?

Correct AnswerverifiedShow Answer

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Aaron probably has myasthenia ...
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Correct Answer
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These activities are isotonic exercises ...
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Correct Answer
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Correct Answer
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Correct Answer
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Norepinephrine's effects depen...
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Correct Answer
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Correct Answer
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Correct Answer
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Following the death of an individual, AT...
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Correct Answer
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Correct Answer
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Correct Answer
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1. The first 4- 6 seconds of energy come...
View Answer

Correct Answer
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Correct Answer
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Folds on the surface...
View Answer

Correct Answer
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Correct Answer
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Correct Answer
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