Question 1

Enlarged portions of the sarcoplasmic reticulum are called __________.

Accepted Answer

A)   synaptic clefts
B)   cisternae
C)   H zones
D)   T tubules
E)   motor end platesF) B) and E)
G) None of the above

Question 2

The muscle most responsible for a particular movement is called the prime mover or antagonist.

Accepted Answer

A) True 
 B)False

Question 3

What is the effect of an increased concentration of calcium ion in the sarcoplasm?

Accepted Answer

A)   Actin binding sites become exposed.
B)   Myosin binding sites become exposed.
C)   Troponin binding sites become exposed.
D)   Actin and myosin become unable to accomplish contraction.E) A) and D)
F) B) and D)

Question 4

By what means does an electrical impulse travel deep into a skeletal muscle fiber in order to trigger a contraction?

Accepted Answer

A)   Via the sarcoplasmic reticulum
B)   Via transverse tubules
C)   Via mitochondria
D)   Via motor end plates
E)   Via gap junctionsF) C) and D)
G) A) and B)

Question 5

What term refers to the attachment point for the movable end of the muscle?

Accepted Answer

A)   Origin
B)   Fulcrum
C)   Insertion
D)   Motor end plate
E)   SourceF) A) and B)
G) C) and D)

Question 6

What term refers to the increase in the number of motor units activated as a result ofmore intensestimulation?

Accepted Answer

A)   Twitch
B)   Recruitment
C)   Threshold stimulation
D)   All-or-none response
E)   SummationF) A) and E)
G) A) and B)

Question 7

Name the membranouschannels or tunnels that extend inward from

Accepted Answer

A)   Sarcomeres
B)   Myofibrils
C)   Transverse tubules
D)   Cisternae
E)   Motor end platesF) A) and B)
G) A) and C)

Question 8

What neurotransmitter is used to stimulate skeletal muscle contraction?

Accepted Answer

A)   Norepinephrine
B)   Actin
C)   Acetylcholine
D)   Tropomyosin
E)   ATPF) A) and D)
G) B) and E)

Question 9

How is creatine phosphate used by muscle cells?

Accepted Answer

A)   It causes the decomposition of ATP.
B)   It forms part of the thin filaments.
C)   It is used to regenerate ATP.
D)   It supplies energy for the breakdown ofATP to ADP.
E)   It breaks down acetylcholine, allowing relaxation to occur.F) All of the above
G) A) and E)

Question 10

What is an example of a partial but sustained contraction of a whole muscle?

Accepted Answer

A)   Blinking an eyelid
B)   Tetanic contraction
C)   Muscle twitch
D)   Maintenance of posture
E)   Motor unit fatigueF) A) and B)
G) A) and C)

Question 11

What is the action of the enzyme acetylcholinesterase?

Accepted Answer

A)   Needed for acetylcholine bind to troponin
B)   Causes secretion of acetylcholine into synaptic cleft
C)   Breaks down acetylcholine
D)   Forms cross-bridge between acetylcholine molecules and acetylcholine receptors
E)   Stimulates production of acetylcholine within synaptic vesiclesF) B) and E)
G) None of the above

Question 12

What neurotransmitter is used to stimulate skeletal muscle contraction?

Accepted Answer

A)   Norepinephrine
B)   Actin
C)   Acetylcholine
D)   Tropomyosin
E)   ATPF) A) and D)
G) C) and D)

Question 13

During the process of glycolysis, the breakdown of one glucose molecules results in production of two ATP molecules.

Accepted Answer

A) True 
 B)False

Question 14

The time between the stimulation of a muscle fiber and the beginning of contraction iscalled the __________ period.

Accepted Answer

The answer of The time between the stimulation of a...

Question 15

What type of muscle fiber will be more resistant to fatigue?

Accepted Answer

A)   Fast fiber
B)   Slow fiberC) A) and B)
D) undefined

Question 16

What forms the myofibrils of skeletal muscle cells?

Accepted Answer

A)   Actin and myosin
B)   ATP and ADP
C)   Troponin and tropomyosin
D)   Fascia and tendons
E)   Perimysium and endomysiumF) B) and E)
G) B) and C)

Question 17

What happens to a muscle that has lost its innervation?

Accepted Answer

A)   It undergoes hypertrophy.
B)   It stimulates the formation of new motor neurons.
C)   It undergoes atrophy.
D)   The muscle fibers enlarge in order to still undergo contraction.E) A) and C)
F) B) and C)

Question 18

Name the membranouschannels or tunnels that extend inward from

Accepted Answer

A)   Sarcomeres
B)   Myofibrils
C)   Transverse tubules
D)   Cisternae
E)   Motor end platesF) A) and E)
G) A) and D)

Question 19

Compared to skeletal muscle, smooth muscle contracts __________ and relaxes __________.

Accepted Answer

A)   more slowly; more slowly
B)   more slowly; more rapidly
C)   more rapidly; more slowly
D)   more rapidly; more rapidlyE) All of the above
F) A) and C)

Question 20

The characteristic reddish color of skeletal muscle is due to the presence of what substance?

Accepted Answer

A)   Actin
B)   Myosin
C)   Myoglobin
D)   Calcium
E)   GlycogenF) B) and E)
G) A) and B)

Exam 8: Muscular System

What is the effect of an increased concentration of calcium ion in the sarcoplasm?

Correct AnswerverifiedShow Answer

How is creatine phosphate used by muscle cells?

Correct AnswerverifiedShow Answer

What term refers to the increase in the number of motor units activated as a result ofmore intensestimulation?

Correct AnswerverifiedShow Answer

The time between the stimulation of a muscle fiber and the beginning of contraction iscalled the __________ period.

Correct AnswerverifiedShow Answer

Enlarged portions of the sarcoplasmic reticulum are called __________.

Correct AnswerverifiedShow Answer

What is an example of a partial but sustained contraction of a whole muscle?

Correct AnswerverifiedShow Answer

Compared to skeletal muscle, smooth muscle contracts __________ and relaxes __________.

Correct AnswerverifiedShow Answer

What happens to a muscle that has lost its innervation?

Correct AnswerverifiedShow Answer

The characteristic reddish color of skeletal muscle is due to the presence of what substance?

Correct AnswerverifiedShow Answer

By what means does an electrical impulse travel deep into a skeletal muscle fiber in order to trigger a contraction?

Correct AnswerverifiedShow Answer

What neurotransmitter is used to stimulate skeletal muscle contraction?

Correct AnswerverifiedShow Answer

The muscle most responsible for a particular movement is called the prime mover or antagonist.

Correct AnswerverifiedShow Answer

Name the membranouschannels or tunnels that extend inward from

Correct AnswerverifiedShow Answer

Name the membranouschannels or tunnels that extend inward from

Correct AnswerverifiedShow Answer

What is the action of the enzyme acetylcholinesterase?

Correct AnswerverifiedShow Answer

What neurotransmitter is used to stimulate skeletal muscle contraction?

Correct AnswerverifiedShow Answer

During the process of glycolysis, the breakdown of one glucose molecules results in production of two ATP molecules.

Correct AnswerverifiedShow Answer

What term refers to the attachment point for the movable end of the muscle?

Correct AnswerverifiedShow Answer

What type of muscle fiber will be more resistant to fatigue?

Correct AnswerverifiedShow Answer

What forms the myofibrils of skeletal muscle cells?

Correct AnswerverifiedShow Answer

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Compared to skeletal muscle, smooth muscle contracts and relaxes .

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