Question 1

The smallest contractile unit of muscle is a:

Accepted Answer

A)   fiber.
B)   myofibril.
C)   sarcomere.
D)   myofilament.E) None of the above
F) All of the above

Question 2

A triad consists of a T-tubule sandwiched between sacs of the sarcoplasmic reticulum.

Accepted Answer

A) True 
 B)False

Question 3

The graded strength principle states that:

Accepted Answer

A)   muscle fibers either will contract with all the force possible under existing conditions or will not contract at all.
B)   skeletal muscles contract with the same degree of strength at all times, but the force generated is graded.
C)   muscle size is indirectly proportional to muscle strength.
D)   skeletal muscles contract with varying degrees of strength at different times.E) None of the above
F) A) and B)

Question 4

The cell membrane of a muscle fiber is called the sarcolemma.

Accepted Answer

A) True 
 B)False

Question 5

Which type of muscle is responsible for peristalsis?

Accepted Answer

A)   Multiunit smooth
B)   Single-unit smooth
C)   Cardiac
D)   StriatedE) None of the above
F) A) and D)

Question 6

List three conditions that influence the strength of muscle contraction.

Accepted Answer

The strength of muscle contraction can b...

Question 7

The neurotransmitter(s)  secreted at the motor end plates of skeletal muscles is(are) :

Accepted Answer

A)   dopamine.
B)   norepinephrine.
C)   acetylcholine.
D)   any of the above.E) All of the above
F) C) and D)

Question 8

Match each term with its corresponding definition or description.
-Name given to the plasma membrane of a muscle cell

Accepted Answer

A)  Actin
B)  Sarcolemma
C)  Contractility
D)  Tropomyosin
E)  ExtensibilityF) MyosinG) T-tubuleH) IrritabilityI) SarcomereJ) TroponinK) Motor unitL) I) and J)
M) G) and H)

Question 9

Multiunit smooth muscle is more common in the body than single-unit smooth muscle.

Accepted Answer

A) True 
 B)False

Question 10

Myofibrils contain several sarcomeres lined up end to end.

Accepted Answer

A) True 
 B)False

Question 11

The longer the initial length of a muscle, the stronger the contraction of that muscle can be.

Accepted Answer

A) True 
 B)False

Question 12

Which of the following is not one of the major functions of muscles?

Accepted Answer

A)   Movement
B)   Protection
C)   Heat production
D)   PostureE) B) and C)
F) A) and B)

Question 13

A motor neuron plus the muscle fibers to which it attaches is called a motor unit.

Accepted Answer

A) True 
 B)False

Question 14

When troponin and calcium combine, it causes actin to shift and allows the myosin to form cross-bridges.

Accepted Answer

A) True 
 B)False

Question 15

Skeletal muscle has a great ability to stretch.

Accepted Answer

A) True 
 B)False

Question 16

The H-zone in a relaxed sarcomere is composed of only myosin.

Accepted Answer

A) True 
 B)False

Question 17

As resistance increases, the number of motor units needed to overcome that resistance has to increase.

Accepted Answer

A) True 
 B)False

Question 18

Match each term with its corresponding definition or description.
-The ability of a muscle cell to shorten

Accepted Answer

A)  Actin
B)  Sarcolemma
C)  Contractility
D)  Tropomyosin
E)  ExtensibilityF) MyosinG) T-tubuleH) IrritabilityI) SarcomereJ) TroponinK) Motor unitL) A) and B)
M) A) and E)

Question 19

In the "warmed up" muscle, the calcium ions are able to be completely returned to the sarcoplasmic reticulum.

Accepted Answer

A) True 
 B)False

Question 20

Match each term with its corresponding definition or description.
-A neuron and all the muscle fibers it stimulates

Accepted Answer

A)  Actin
B)  Sarcolemma
C)  Contractility
D)  Tropomyosin
E)  ExtensibilityF) MyosinG) T-tubuleH) IrritabilityI) SarcomereJ) TroponinK) Motor unitL) I) and J)
M) B) and G)

Exam 17: Muscle Contraction

Myofibrils contain several sarcomeres lined up end to end.

Correct AnswerverifiedShow Answer

When troponin and calcium combine, it causes actin to shift and allows the myosin to form cross-bridges.

Correct AnswerverifiedShow Answer

The neurotransmitter(s) secreted at the motor end plates of skeletal muscles is(are) :

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Which type of muscle is responsible for peristalsis?

Correct AnswerverifiedShow Answer

The cell membrane of a muscle fiber is called the sarcolemma.

Correct AnswerverifiedShow Answer

As resistance increases, the number of motor units needed to overcome that resistance has to increase.

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Match each term with its corresponding definition or description. -The ability of a muscle cell to shorten

Correct AnswerverifiedShow Answer

Multiunit smooth muscle is more common in the body than single-unit smooth muscle.

Correct AnswerverifiedShow Answer

The smallest contractile unit of muscle is a:

Correct AnswerverifiedShow Answer

The longer the initial length of a muscle, the stronger the contraction of that muscle can be.

Correct AnswerverifiedShow Answer

A motor neuron plus the muscle fibers to which it attaches is called a motor unit.

Correct AnswerverifiedShow Answer

Skeletal muscle has a great ability to stretch.

Correct AnswerverifiedShow Answer

In the "warmed up" muscle, the calcium ions are able to be completely returned to the sarcoplasmic reticulum.

Correct AnswerverifiedShow Answer

The H-zone in a relaxed sarcomere is composed of only myosin.

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Match each term with its corresponding definition or description. -A neuron and all the muscle fibers it stimulates

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Which of the following is not one of the major functions of muscles?

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Match each term with its corresponding definition or description. -Name given to the plasma membrane of a muscle cell

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List three conditions that influence the strength of muscle contraction.

Correct AnswerAnswered by ExamLex AIThe strength of muscle contraction can b...View AnswerShow Answer

A triad consists of a T-tubule sandwiched between sacs of the sarcoplasmic reticulum.

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The graded strength principle states that:

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The strength of muscle contraction can b...
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