Question 1

What structures consist of actin and myosin filaments?

Accepted Answer

A)   Myofibrils
B)   T tubules
C)   Aponeuroses
D)   Fascicles
E)   Thick filamentsF) D) and E)
G) A) and C)

Question 2

Activities such as distance swimming and distance running are most likely to stimulate the development of what type of muscle fiber?

Accepted Answer

A)   Slow fibers
B)   Fast fibersC) A) and B)
D) undefined

Question 3

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 D)
G) A) and E)

Question 4

Myasthenia gravis is an autoimmune disease in which an individual's own immune system produces antibodies to acetylcholine receptors, blocking or destroying them. What would be a major symptom of this disease?

Accepted Answer

A)   Muscle weakness
B)   Muscle spasms or cramps
C)   Hypertrophy of affected muscles
D)   Loss of motor neuron functionE) B) and C)
F) A) and B)

Question 5

What is the name of the functional connection between a motor neuron and a muscle cell?

Accepted Answer

A)   Motor end plate
B)   Synaptic cleft
C)   Synaptic vesicle
D)   Junctional plate
E)   Neuromuscular junctionF) C) and D)
G) A) and B)

Question 6

What term describes the muscle that is primarily responsible for opposing a particular action?

Accepted Answer

A)   Antagonist
B)   Prime mover
C)   Synergist
D)   AgonistE) B) and C)
F) A) and D)

Question 7

What type of smooth muscle is found in the wall of the stomach?

Accepted Answer

A)   Striated muscle
B)   Visceral muscle
C)   Multiunit muscle
D)   Intercalated muscleE) B) and C)
F) A) and D)

Question 8

Using the muscle name as a clue, what is the action of the extensor carpi ulnaris?

Accepted Answer

A)   To extend the wrist
B)   To extend the arm at the shoulder
C)   To dorsiflex the foot
D)   To extend the leg at the kneeE) A) and B)
F) A) and D)

Question 9

The two neurotransmitters that affect smooth muscle cells are acetylcholine and __________.

Accepted Answer

The answer of The two neurotransmitters that affect smooth muscle...

Question 10

What is the effect of ATP binding to myosin?

Accepted Answer

A)   Cross-bridges form
B)   Cross-bridges break
C)   Troponin and tropomyosin interact to expose binding sites on actin
D)   Thin filaments become shorter, causing shortening of the sarcomereE) None of the above
F) B) and D)

Question 11

The two neurotransmitters that affect smooth muscle cells are acetylcholine and __________.

Accepted Answer

The answer of The two neurotransmitters that affect smooth muscle...

Question 12

Using the muscle name as a clue, what is the action of the extensor carpi ulnaris?

Accepted Answer

A)   To extend the wrist
B)   To extend the arm at the shoulder
C)   To dorsiflex the foot
D)   To extend the leg at the kneeE) B) and C)
F) A) and D)

Question 13

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 14

Which of the following is NOT a basic component of a lever?

Accepted Answer

A)   Rigid bar
B)   Fulcrum
C)   Force
D)   Handle
E)   ResistanceF) B) and C)
G) A) and E)

Question 15

What is formed by a motor neuron and all the muscle cells it stimulates?

Accepted Answer

A)   Neuromuscular bundle
B)   Fascicle
C)   Motor unit
D)   Myofibril
E)   Motor end plateF) C) and D)
G) A) and D)

Question 16

Activities such as distance swimming and distance running are most likely to stimulate the development of what type of muscle fiber?

Accepted Answer

A)   Slow fibers
B)   Fast fibersC) A) and B)
D) undefined

Question 17

Where are the vesicles that contain neurotransmitter molecules located?

Accepted Answer

A)   Within sarcoplasmic reticulum
B)   In synaptic cleft
C)   On motor end plate membranes
D)   In cytoplasm of motor neuron axon
E)   At boundaries of sarcomeresF) A) and E)
G) A) and B)

Question 18

With training, what changes will occur in the muscles of the lower limbs of a marathon runner?

Accepted Answer

A)   Development of more extensive capillary networks; cells develop more mitochondria
B)   Formation of more actin and myosin, causing enlargement of muscle fibers
C)   Loss of myoglobin and reduction in size of muscle fibers
D)   Drastic increase in number of muscle fibersE) All of the above
F) A) and B)

Question 19

When acetylcholine binds to its receptors at the motor end plate, the muscle fiber membrane becomes more permeable to __________.

Accepted Answer

A)   potassium
B)   sodium
C)   calcium
D)   acetylcholine
E)   acetylcholinesteraseF) B) and E)
G) All of the above

Question 20

What type of neurons function to control effectors?

Accepted Answer

A)   Aerobic neurons
B)   Sensory neurons
C)   Axon terminals
D)   Motor neurons
E)   Motor unitsF) B) and D)
G) C) and E)

Exam 8: Muscular System

With training, what changes will occur in the muscles of the lower limbs of a marathon runner?

Correct AnswerverifiedShow Answer

What structures consist of actin and myosin filaments?

Correct AnswerverifiedShow Answer

When acetylcholine binds to its receptors at the motor end plate, the muscle fiber membrane becomes more permeable to __________.

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

Activities such as distance swimming and distance running are most likely to stimulate the development of what type of muscle fiber?

Correct AnswerverifiedShow Answer

Activities such as distance swimming and distance running are most likely to stimulate the development of what type of muscle fiber?

Correct AnswerverifiedShow Answer

What type of neurons function to control effectors?

Correct AnswerverifiedShow Answer

Which of the following is NOT a basic component of a lever?

Correct AnswerverifiedShow Answer

The two neurotransmitters that affect smooth muscle cells are acetylcholine and __________.

Correct AnswerverifiedShow Answer

Where are the vesicles that contain neurotransmitter molecules located?

Correct AnswerverifiedShow Answer

Myasthenia gravis is an autoimmune disease in which an individual's own immune system produces antibodies to acetylcholine receptors, blocking or destroying them. What would be a major symptom of this disease?

Correct AnswerverifiedShow Answer

What type of smooth muscle is found in the wall of the stomach?

Correct AnswerverifiedShow Answer

Using the muscle name as a clue, what is the action of the extensor carpi ulnaris?

Correct AnswerverifiedShow Answer

What term describes the muscle that is primarily responsible for opposing a particular action?

Correct AnswerverifiedShow Answer

Using the muscle name as a clue, what is the action of the extensor carpi ulnaris?

Correct AnswerverifiedShow Answer

The two neurotransmitters that affect smooth muscle cells are acetylcholine and __________.

Correct AnswerverifiedShow Answer

What is formed by a motor neuron and all the muscle cells it stimulates?

Correct AnswerverifiedShow Answer

What is the effect of ATP binding to myosin?

Correct AnswerverifiedShow Answer

What is the name of the functional connection between a motor neuron and a muscle cell?

Correct AnswerverifiedShow Answer

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