Question 1

A weightlifter uses muscles so the muscles exert more than 75% of their maximum tension,this stimulates

Accepted Answer

A)  an increase in slow,fatigable white fibers.
B)  muscle fibers developing new filaments of actin and myosin.
C)  shrinking of skeletal muscle.
D)  conversion of skeletal to smooth muscle.E) B) and D)
F) None of the above

Question 2

Smooth muscle lacks

Accepted Answer

A)  actin and myosin.
B)  transverse tubules and striations.
C)  myofibrils.
D)  nuclei and mitochondria.E) B) and C)
F) B) and D)

Question 3

Acetylcholine released by the myofibril crosses the synaptic cleft to bind to the motor neuron ending.

Accepted Answer

A) True 
 B)False

Question 4

The buccinator muscle is in the

Accepted Answer

A)  buttocks.
B)  chest.
C)  bladder.
D)  cheek.E) A) and B)
F) A) and C)

Question 5

A plank position is part of a yoga/Pilates workout.The person supports the body on the floor in a prone position with the arms and feet supporting the body.It is a little like the "up" position of a push-up,held for 30 to 60 seconds.Contraction of the abdominal muscles in a plank is most likely

Accepted Answer

A)  isotonic.
B)  eccentric.
C)  isometriC.
D)  concentric.E) A) and B)
F) None of the above

Question 6

A muscle fiber exposed to a series of stimuli of increasing frequency combines individual twitches (summation) which results in

Accepted Answer

A)  complete sustained contraction.
B)  muscle tone.
C)  a latent period.
D)  flaccid muscles.E) B) and D)
F) B) and C)

Question 7

The rhythmic,wavelike motion produced by smooth muscles in tubular visceral organs is called _______.

Accepted Answer

The answer of The rhythmic,wavelike motion produced by smooth muscles...

Question 8

Cardiac muscle

Accepted Answer

A)  contracts as a syncytium.
B)  excites itself.
C)  is only in the heart.
D)  all of the above.E) B) and C)
F) A) and D)

Question 9

The increase in the number of motor units activated as a result of more intense stimulation is called

Accepted Answer

A)  latency.
B)  recruitment.
C)  threshold stimulation.
D)  sustained contraction.E) A) and B)
F) All of the above

Question 10

The ______ ______ at the ends of cardiac muscle cells help to join cells.

Accepted Answer

The answer of The ______ ______ at the ends of...

Question 11

The functional connection between a neuron and a skeletal muscle fiber is a

Accepted Answer

A)  synapse.
B)  fascia.
C)  neuroma.
D)  dendrite.E) B) and D)
F) A) and B)

Question 12

The muscle that causes an action is the

Accepted Answer

A)  synergist.
B)  antagonist.
C)  agonist.
D)  mediator.E) None of the above
F) A) and D)

Question 13

__________ degrades acetylcholine,keeping it from accumulating in the synapse.

Accepted Answer

A)  ATPase
B)  Myosinase
C)  Actinase
D)  AcetylcholinesteraseE) C) and D)
F) B) and D)

Question 14

Myofibrils are composed primarily of

Accepted Answer

A)  actin and myosin.
B)  perimysium and endomysium.
C)  troponin and tropomyosin.
D)  fascia and tendons.E) B) and D)
F) A) and D)

Question 15

At a neuromuscular junction

Accepted Answer

A)  actin and myosin filaments slide past one another.
B)  troponin and tropomyosin exchange places.
C)  neurotransmitters are released.
D)  intercalated discs are synthesizeD.E) B) and C)
F) A) and C)

Question 16

ATP is necessary for muscle relaxation.

Accepted Answer

A) True 
 B)False

Question 17

Athletes usually experience muscle fatigue less quickly than nonathletes because they

Accepted Answer

A)  convert glucose to lactic acid.
B)  tolerate high concentrations of carbon dioxide.
C)  make more efficient use of ATP.
D)  produce less lactic aciD.E) A) and B)
F) All of the above

Question 18

Arrange the following steps of muscle fiber contraction in the correct sequence.
1) The muscle impulse reaches the sarcoplasmic reticulum and calcium is released.
2) Thin filaments are pulled over the thick filaments.
3) Calcium floods the sarcoplasm and binds to troponin molecules leaving active sites.
4) The impulse arrives at the synapse and travels through the transverse tubules.
5) The muscle fiber shortens and contracts.
6) Myosin heads bind to exposed active sites on actin,forming cross-bridges.

Accepted Answer

A)  6,3,1,4,2,5
B)  2,5,3,1,4,6
C)  4,1,3,6,2,5
D)  3,5,2,1,6,4E) None of the above
F) A) and B)

Question 19

Tawanda finishes a sprint and suffers great pain in her calf muscles.Her muscle cramps are most likely due to a temporary deficit of

Accepted Answer

A)  actin.
B)  myosin.
C)  ATP.
D)  ADP.E) C) and D)
F) B) and D)

Question 20

The muscle that opposes a particular action is called the

Accepted Answer

A)  synergist.
B)  antagonist.
C)  agonist.
D)  prime mover.E) B) and D)
F) None of the above

Exam 9: Muscular System

ATP is necessary for muscle relaxation.

Correct Answer
verified

The muscle that causes an action is the

Correct Answer
verified

Smooth muscle lacks

Correct Answer
verified

A muscle fiber exposed to a series of stimuli of increasing frequency combines individual twitches (summation) which results in

Correct Answer
verified

A plank position is part of a yoga/Pilates workout.The person supports the body on the floor in a prone position with the arms and feet supporting the body.It is a little like the "up" position of a push-up,held for 30 to 60 seconds.Contraction of the abdominal muscles in a plank is most likely

Correct Answer
verified

At a neuromuscular junction

Correct Answer
verified

The increase in the number of motor units activated as a result of more intense stimulation is called

Correct Answer
verified

The at the ends of cardiac muscle cells help to join cells.

Correct Answer
verified

__________ degrades acetylcholine,keeping it from accumulating in the synapse.

Correct Answer
verified

The functional connection between a neuron and a skeletal muscle fiber is a

Correct Answer
verified

Acetylcholine released by the myofibril crosses the synaptic cleft to bind to the motor neuron ending.

Correct Answer
verified

The rhythmic,wavelike motion produced by smooth muscles in tubular visceral organs is called _______.

Correct Answer
verified

A weightlifter uses muscles so the muscles exert more than 75% of their maximum tension,this stimulates

Correct Answer
verified

The muscle that opposes a particular action is called the

Correct Answer
verified

Correct Answer
verified

Athletes usually experience muscle fatigue less quickly than nonathletes because they

Correct Answer
verified

Myofibrils are composed primarily of

Correct Answer
verified

The buccinator muscle is in the

Correct Answer
verified

Tawanda finishes a sprint and suffers great pain in her calf muscles.Her muscle cramps are most likely due to a temporary deficit of

Correct Answer
verified

Cardiac muscle

Correct Answer
verified

Exam 9: Muscular System

ATP is necessary for muscle relaxation.

Correct AnswerverifiedShow Answer

The muscle that causes an action is the

Correct AnswerverifiedShow Answer

Smooth muscle lacks

Correct AnswerverifiedShow Answer

A muscle fiber exposed to a series of stimuli of increasing frequency combines individual twitches (summation) which results in

Correct AnswerverifiedShow Answer

A plank position is part of a yoga/Pilates workout.The person supports the body on the floor in a prone position with the arms and feet supporting the body.It is a little like the "up" position of a push-up,held for 30 to 60 seconds.Contraction of the abdominal muscles in a plank is most likely

Correct AnswerverifiedShow Answer

At a neuromuscular junction

Correct AnswerverifiedShow Answer

The increase in the number of motor units activated as a result of more intense stimulation is called

Correct AnswerverifiedShow Answer

The ______ ______ at the ends of cardiac muscle cells help to join cells.

Correct AnswerverifiedShow Answer

__________ degrades acetylcholine,keeping it from accumulating in the synapse.

Correct AnswerverifiedShow Answer

The functional connection between a neuron and a skeletal muscle fiber is a

Correct AnswerverifiedShow Answer

Acetylcholine released by the myofibril crosses the synaptic cleft to bind to the motor neuron ending.

Correct AnswerverifiedShow Answer

The rhythmic,wavelike motion produced by smooth muscles in tubular visceral organs is called _______.

Correct AnswerverifiedShow Answer

A weightlifter uses muscles so the muscles exert more than 75% of their maximum tension,this stimulates

Correct AnswerverifiedShow Answer

The muscle that opposes a particular action is called the

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Athletes usually experience muscle fatigue less quickly than nonathletes because they

Correct AnswerverifiedShow Answer

Myofibrils are composed primarily of

Correct AnswerverifiedShow Answer

The buccinator muscle is in the

Correct AnswerverifiedShow Answer

Tawanda finishes a sprint and suffers great pain in her calf muscles.Her muscle cramps are most likely due to a temporary deficit of

Correct AnswerverifiedShow Answer

Cardiac muscle

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
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Correct Answer
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Correct Answer
verified

Correct Answer
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Correct Answer
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Correct Answer
verified

The at the ends of cardiac muscle cells help to join cells.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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