Question 1

Regarding muscle fiber elongation,

Accepted Answer

A)  many active mechanisms exist for muscle fiber elongation.
B)  muscle contraction is passive; whereas,elongation is active.
C)  opposing muscle movements are not a factor.
D)  gravity may help lengthen a muscle fiber after elongation.
E)  elastic forces are generated where a muscle fiber elongates.

Question 2

Which of the following occurs as a result of motor units in a particular muscle being always active,even though their contractions do not produce enough movement to cause contraction?

Accepted Answer

A)  treppe
B)  tetany
C)  muscle tone
D)  fatigue
E)  a twitch

Question 3

Which of the following is true about red muscles?

Accepted Answer

A)  Red muscles are slower than white muscles.
B)  Red muscles have fewer mitochondria than white muscles.
C)  Red muscles have fibers of greater diameter than those of white muscles.
D)  Red muscles contain less myoglobin than white muscles.
E)  Red muscles fatigue quickly.

Question 4

Skeletal muscle fibers differ from "typical cells" in that these muscle fibers

Accepted Answer

A)  lack a plasma membrane.
B)  have many nuclei.
C)  are very small.
D)  lack mitochondria.
E)  contain endoplasmic reticulum.

Question 5

Which of the following muscles is named for its shape?

Accepted Answer

A)  pectoralis major
B)  biceps brachii
C)  deltoid
D)  erector spinae
E)  tibialis anterior

Question 6

After death,rigor mortis lasts until

Accepted Answer

A)  ATP is produced.
B)  T-tubules recapture calcium ions.
C)  sodium ions are released by the sarcoplasmic reticulum.
D)  sarcomeres lengthen.
E)  myofilaments are broken down.

Question 7

A person whose genetic makeup makes him or her a better marathon runner than a sprinter probably has more ________ in his or her leg muscles.

Accepted Answer

A)  fast fibers
B)  intermediate fibers
C)  slow fibers
D)  dark fibers
E)  red fibers

Question 8

Which of the following muscles acts to flex the finger joints and wrist?

Accepted Answer

A)  brachioradialis
B)  flexor digitorum
C)  flexor carpi ulnaris
D)  pronator teres
E)  flexor carpi radialis

Question 9

The muscle that dorsiflexes the foot is the

Accepted Answer

A)  tibialis anterior.
B)  tibialis posterior.
C)  soleus.
D)  peroneus.
E)  gastrocnemius.

Question 10

While unloading the trunk of her car,Amy pulls a muscle.As a result,she has difficulty moving her arm.The attending physician in the emergency room tells her that she injured her latissimus dorsi muscle.Knowing that the latissimus dorsi was a back muscle,Amy doesn't understand what the muscle has to do with her injured arm.Explain the involvement of the muscle in Amy's injury.

Accepted Answer

Although the latissimus dorsi muscle is ...

Question 11

Which muscle is not part of the rotator cuff set of muscles?

Accepted Answer

A)  supraspinatus
B)  subscapularis
C)  teres minor
D)  biceps brachii
E)  teres major

Question 12

Muscle fascicles are separated by

Accepted Answer

A)  endomysium.
B)  perimysium.
C)  epimysium.
D)  sarcolemma.
E)  periosteum.

Question 13

Which statement regarding skeletal muscle is true?

Accepted Answer

A)  Skeletal muscles are directly,but not indirectly,attached to bones.
B)  Skeletal muscles do not contain connective tissue.
C)  Skeletal muscles do not maintain body temperature.
D)  Skeletal muscles do not contain nervous tissue.
E)  Skeletal muscles contain blood vessels.

Question 14

The area of the sarcomere that is the light region between two successive A-bands is the

Accepted Answer

A)  Z line.
B)  M line.
C)  I band.
D)  myofibril.
E)  H band.

Question 15

Why do individual muscle twitches have to be added together,as in summation or tetanus?

Accepted Answer

A)  Only added twitches produce any muscle contraction: A fiber undergoing a muscle twitch does not contract at all.
B)  There has to be a critical mass of muscle twitches for calcium to be released into the muscle cell.
C)  Not enough acetylcholine will be produced for contraction without multiple twitches.
D)  Multiple twitches add up to an increase in muscle fiber tension,which increases the strength of the muscle.
E)  Not enough ATP is generated by one muscle twitch.

Exam 7: The Muscular System

Muscle fascicles are separated by

Correct Answer
verified

Skeletal muscle fibers differ from "typical cells" in that these muscle fibers

Correct Answer
verified

Which of the following is true about red muscles?

Correct Answer
verified

After death,rigor mortis lasts until

Correct Answer
verified

Why do individual muscle twitches have to be added together,as in summation or tetanus?

Correct Answer
verified

Which of the following muscles is named for its shape?

Correct Answer
verified

The area of the sarcomere that is the light region between two successive A-bands is the

Correct Answer
verified

Which muscle is not part of the rotator cuff set of muscles?

Correct Answer
verified

Which statement regarding skeletal muscle is true?

Correct Answer
verified

Regarding muscle fiber elongation,

Correct Answer
verified

A person whose genetic makeup makes him or her a better marathon runner than a sprinter probably has more ________ in his or her leg muscles.

Correct Answer
verified

Which of the following occurs as a result of motor units in a particular muscle being always active,even though their contractions do not produce enough movement to cause contraction?

Correct Answer
verified

The muscle that dorsiflexes the foot is the

Correct Answer
verified

Correct Answer
verified
Although the latissimus dorsi muscle is ...
View Answer

Which of the following muscles acts to flex the finger joints and wrist?

Correct Answer
verified

Exam 7: The Muscular System

Muscle fascicles are separated by

Correct AnswerverifiedShow Answer

Skeletal muscle fibers differ from "typical cells" in that these muscle fibers

Correct AnswerverifiedShow Answer

Which of the following is true about red muscles?

Correct AnswerverifiedShow Answer

After death,rigor mortis lasts until

Correct AnswerverifiedShow Answer

Why do individual muscle twitches have to be added together,as in summation or tetanus?

Correct AnswerverifiedShow Answer

Which of the following muscles is named for its shape?

Correct AnswerverifiedShow Answer

The area of the sarcomere that is the light region between two successive A-bands is the

Correct AnswerverifiedShow Answer

Which muscle is not part of the rotator cuff set of muscles?

Correct AnswerverifiedShow Answer

Which statement regarding skeletal muscle is true?

Correct AnswerverifiedShow Answer

Regarding muscle fiber elongation,

Correct AnswerverifiedShow Answer

A person whose genetic makeup makes him or her a better marathon runner than a sprinter probably has more ________ in his or her leg muscles.

Correct AnswerverifiedShow Answer

Which of the following occurs as a result of motor units in a particular muscle being always active,even though their contractions do not produce enough movement to cause contraction?

Correct AnswerverifiedShow Answer

The muscle that dorsiflexes the foot is the

Correct AnswerverifiedShow Answer

Correct AnswerverifiedAlthough the latissimus dorsi muscle is ...View AnswerShow Answer

Which of the following muscles acts to flex the finger joints and wrist?

Correct AnswerverifiedShow Answer

Correct Answer
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Correct Answer
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Correct Answer
verified
Although the latissimus dorsi muscle is ...
View Answer

Correct Answer
verified