Question 1

Muscle cells will contract slightly for a weak stimulus and much more forcefully for a stronger stimulus.

Accepted Answer

A) True 
 B)False

Question 2

Muscle tone maintains posture.

Accepted Answer

A) True 
 B)False

Question 3

The thin myofilaments in a skeletal muscle are composed of actin.

Accepted Answer

A) True 
 B)False

Question 4

What makes up a motor unit, and what is the neuromuscular junction?

Accepted Answer

A motor unit is composed of a motor neur...

Question 5

If the muscles of a weightlifter and a marathon runner were compared, the marathon runner would have

Accepted Answer

A)   more mitochondria in each muscle cell.
B)   larger muscle cells.
C)   more muscle cells.
D)   both A and C.E) A) and D)
F) B) and C)

Question 6

Shivering helps a person with hypothermia because muscle contractions produce heat.

Accepted Answer

A) True 
 B)False

Question 7

Match each muscle with its corresponding description or location.
-Pair of muscles that allow a person to flex the head to the chest

Accepted Answer

A)  Triceps brachii
B)  Pectoralis major
C)  Masseter
D)  Sternocleidomastoid
E)  ZygomaticusF) DeltoidG) Biceps brachiiH) Latissimus dorsiI) B) and F)
J) C) and H)

Question 8

The "heads" of which molecules form crossbridges during muscle contraction?

Accepted Answer

A)   Actin
B)   The thin filament
C)   Myosin
D)   Both A and BE) C) and D)
F) A) and B)

Question 9

Match each term with its corresponding definition or description.
-Protein that makes up the thin myofilament

Accepted Answer

A)  Voluntary muscle
B)  Visceral muscle
C)  Intercalated disks
D)  Origin
E)  SarcomereF) InsertionG) ActinH) Z lineI) BursaeJ) MyosinK) A) and B)
L) B) and I)

Question 10

In an isotonic contraction, the muscle itself actually shortens.

Accepted Answer

A) True 
 B)False

Question 11

Which of the following contractions is seen in an isolated muscle fiber in the laboratory but plays a minimal role in normal muscle activity?

Accepted Answer

A)   Isometric
B)   Twitch
C)   Isotonic
D)   TectonicE) B) and C)
F) A) and B)

Question 12

Explain the sliding filament theory of muscle contraction.

Accepted Answer

The sliding filament theory of muscle co...

Question 13

Explain the microscopic structure of the skeletal muscle.

Accepted Answer

The skeletal muscle is composed of long,...

Question 14

The model that explains how a muscle contracts is called the sliding filament model.

Accepted Answer

A) True 
 B)False

Question 15

Describe the progression of Duchenne muscular dystrophy.

Accepted Answer

Duchenne muscular dystrophy is a genetic...

Question 16

Match each muscle to its corresponding location or description.
-Primary calf muscle

Accepted Answer

A)  External oblique
B)  Gastrocnemius
C)  Quadriceps
D)  Intercostal muscles
E)  Tibialis anteriorF) Hamstring musclesG) Gluteus maximusH) Rectus abdominisI) D) and E)
J) C) and D)

Question 17

Match each muscle with its corresponding description or location.
-One of the muscles used to close the jaw

Accepted Answer

A)  Triceps brachii
B)  Pectoralis major
C)  Masseter
D)  Sternocleidomastoid
E)  ZygomaticusF) DeltoidG) Biceps brachiiH) Latissimus dorsiI) A) and B)
J) F) and H)

Question 18

Match each term with its corresponding definition or description.
-The movement that decreases the angle between two bones

Accepted Answer

A)  Flexion
B)  Extension
C)  Abduction
D)  Adduction
E)  SupinationF) PronationG) RotationH) Plantar flexionI) DorsiflexionJ) D) and E)
K) A) and H)

Question 19

Match each term with its corresponding definition or description.
-Moving a body part toward the midline of the body

Accepted Answer

A)  Flexion
B)  Extension
C)  Abduction
D)  Adduction
E)  SupinationF) PronationG) RotationH) Plantar flexionI) DorsiflexionJ) A) and B)
K) A) and E)

Question 20

Explain why Duchenne muscular dystrophy usually affects boys.

Accepted Answer

Duchenne muscular dystrophy is a genetic...

Exam 9: Muscular System

Which of the following contractions is seen in an isolated muscle fiber in the laboratory but plays a minimal role in normal muscle activity?

Correct AnswerverifiedShow Answer

Muscle cells will contract slightly for a weak stimulus and much more forcefully for a stronger stimulus.

Correct AnswerverifiedShow Answer

If the muscles of a weightlifter and a marathon runner were compared, the marathon runner would have

Correct AnswerverifiedShow Answer

Match each term with its corresponding definition or description. -The movement that decreases the angle between two bones

Correct AnswerverifiedShow Answer

The "heads" of which molecules form crossbridges during muscle contraction?

Correct AnswerverifiedShow Answer

In an isotonic contraction, the muscle itself actually shortens.

Correct AnswerverifiedShow Answer

The model that explains how a muscle contracts is called the sliding filament model.

Correct AnswerverifiedShow Answer

Match each term with its corresponding definition or description. -Protein that makes up the thin myofilament

Correct AnswerverifiedShow Answer

The thin myofilaments in a skeletal muscle are composed of actin.

Correct AnswerverifiedShow Answer

What makes up a motor unit, and what is the neuromuscular junction?

Correct AnswerAnswered by ExamLex AIA motor unit is composed of a motor neur...View AnswerShow Answer

Explain the sliding filament theory of muscle contraction.

Correct AnswerAnswered by ExamLex AIThe sliding filament theory of muscle co...View AnswerShow Answer

Explain why Duchenne muscular dystrophy usually affects boys.

Correct AnswerAnswered by ExamLex AIDuchenne muscular dystrophy is a genetic...View AnswerShow Answer

Match each muscle to its corresponding location or description. -Primary calf muscle

Correct AnswerverifiedShow Answer

Shivering helps a person with hypothermia because muscle contractions produce heat.

Correct AnswerverifiedShow Answer

Muscle tone maintains posture.

Correct AnswerverifiedShow Answer

Explain the microscopic structure of the skeletal muscle.

Correct AnswerAnswered by ExamLex AIThe skeletal muscle is composed of long,...View AnswerShow Answer

Describe the progression of Duchenne muscular dystrophy.

Correct AnswerAnswered by ExamLex AIDuchenne muscular dystrophy is a genetic...View AnswerShow Answer

Match each term with its corresponding definition or description. -Moving a body part toward the midline of the body

Correct AnswerverifiedShow Answer

Match each muscle with its corresponding description or location. -Pair of muscles that allow a person to flex the head to the chest

Correct AnswerverifiedShow Answer

Match each muscle with its corresponding description or location. -One of the muscles used to close the jaw

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Answered by ExamLex AI
A motor unit is composed of a motor neur...
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The sliding filament theory of muscle co...
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Answered by ExamLex AI
Duchenne muscular dystrophy is a genetic...
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Correct Answer
Answered by ExamLex AI
The skeletal muscle is composed of long,...
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Answered by ExamLex AI
Duchenne muscular dystrophy is a genetic...
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