Question 1

The __________ is the gap that separates a muscle cell membrane from the neuron cell membrane in a neuromuscular junction.

Accepted Answer

A)   synaptic cleft
B)   T tubule
C)   motor end plate
D)   synaptic vesicle
E)   sarcoplasmF) A) and B)
G) C) and E)

Question 2

The connective tissue covering that separates a muscle into fascicles is called the __________.

Accepted Answer

A)   perimysium
B)   endomysium
C)   epimysiumD) None of the above
E) All of the above

Question 3

What is the main component of thin filaments?

Accepted Answer

A)   Myofibrils
B)   Acetylcholine
C)   Actin
D)   Myosin
E)   CollagenF) A) and B)
G) A) and E)

Question 4

What results when a muscle fiber is stimulated repeatedly at a fast enough pace that, though it starts to relax between stimuli, it cannot completely relax between contractions?

Accepted Answer

A)   Muscle fatigue
B)   Complete tetaniccontraction
C)   Summation
D)   Peristalsis
E)   RecruitmentF) A) and E)
G) A) and B)

Question 5

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) None of the above
F) A) and B)

Question 6

During the motion that extends the upper limb at the elbow, the elbow joint represents which part of the lever?

Accepted Answer

A)   Rigid bar
B)   Fulcrum
C)   Force
D)   Resistance
E)   HandleF) A) and E)
G) None of the above

Question 7

What is an alternate name for a skeletal muscle cell?

Accepted Answer

A)   Myofibril
B)   Myofilament
C)   Myosin
D)   Muscle fiberE) C) and D)
F) B) and C)

Question 8

Curare is a poison that binds to acetycholine receptors at the motor end plate. What is the result of curare poisoning?

Accepted Answer

A)   Increased acetylcholine production
B)   Lack of neurotransmitter release by the motor neuron
C)   Inability of the muscle fiber to respond to nervous stimulation
D)   Rapid breakdown of acetylcholine by acetylcholinesteraseE) A) and C)
F) B) and C)

Question 9

What type of muscle cell has a sarcoplasmic reticulum that is not well developed?

Accepted Answer

A)   Cardiac muscle cell
B)   Skeletal muscle cell
C)   Smooth muscle cellD) All of the above
E) A) and B)

Question 10

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

Accepted Answer

A) True 
 B)False

Question 11

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) A) and B)
G) A) and E)

Question 12

Where would an antagonist to the sternocleidomastoidmuscles be located?

Accepted Answer

A)   On the posterior side of the body
B)   On the anterior side of the body
C)   Inferior to the clavicleD) A) and C)
E) A) and B)

Question 13

In skeletal muscle, the thick filaments are mainly composed of ___________.

Accepted Answer

A)   myosin
B)   actin
C)   myofibrils
D)   sarcoplasm
E)   Z linesF) A) and B)
G) C) and D)

Question 14

Small, sustained contractions that are the result of repeated nervous stimulation, originating from the spinal cord and stimulating only a few muscle fibers at a time, is called __________.

Accepted Answer

A)   muscle tone
B)   tetanus
C)   summation
D)   a myogram
E)   a twitchF) All of the above
G) A) and D)

Question 15

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) All of the above
G) A) and C)

Question 16

Consider the components of the lever that causes the flexion of the upper limb at the elbow. The fulcrum of the lever is the __________ and the force to move the rigid bar (the forearm bones)  is provided by contraction of the __________.

Accepted Answer

A)   elbow joint; biceps brachii
B)   shoulder joint; triceps brachii
C)   elbow joint; triceps brachii
D)   shoulder joint; biceps brachiiE) All of the above
F) A) and B)

Question 17

Recruitment refers to increasing the number of motor units involved in a muscle contraction.

Accepted Answer

A) True 
 B)False

Question 18

The connective tissue covering that separates a muscle into fascicles is called the __________.

Accepted Answer

A)   perimysium
B)   endomysium
C)   epimysiumD) All of the above
E) B) and C)

Question 19

Acetylcholine released by a motor neuron crosses the synaptic cleft and reaches the motor end plate by diffusion.

Accepted Answer

A) True 
 B)False

Question 20

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) C) and D)

Exam 8: Muscular System

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

Correct AnswerverifiedShow Answer

Where are the vesicles that contain neurotransmitter molecules located?

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Acetylcholine released by a motor neuron crosses the synaptic cleft and reaches the motor end plate by diffusion.

Correct AnswerverifiedShow Answer

The connective tissue covering that separates a muscle into fascicles is called the __________.

Correct AnswerverifiedShow Answer

The connective tissue covering that separates a muscle into fascicles is called the __________.

Correct AnswerverifiedShow Answer

In skeletal muscle, the thick filaments are mainly composed of ___________.

Correct AnswerverifiedShow Answer

Curare is a poison that binds to acetycholine receptors at the motor end plate. What is the result of curare poisoning?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Where would an antagonist to the sternocleidomastoidmuscles be located?

Correct AnswerverifiedShow Answer

Consider the components of the lever that causes the flexion of the upper limb at the elbow. The fulcrum of the lever is the __________ and the force to move the rigid bar (the forearm bones) is provided by contraction of the __________.

Correct AnswerverifiedShow Answer

What structures consist of actin and myosin filaments?

Correct AnswerverifiedShow Answer

What type of muscle cell has a sarcoplasmic reticulum that is not well developed?

Correct AnswerverifiedShow Answer

Small, sustained contractions that are the result of repeated nervous stimulation, originating from the spinal cord and stimulating only a few muscle fibers at a time, is called __________.

Correct AnswerverifiedShow Answer

What is an alternate name for a skeletal muscle cell?

Correct AnswerverifiedShow Answer

During the motion that extends the upper limb at the elbow, the elbow joint represents which part of the lever?

Correct AnswerverifiedShow Answer

What is the main component of thin filaments?

Correct AnswerverifiedShow Answer

What results when a muscle fiber is stimulated repeatedly at a fast enough pace that, though it starts to relax between stimuli, it cannot completely relax between contractions?

Correct AnswerverifiedShow Answer

The __________ is the gap that separates a muscle cell membrane from the neuron cell membrane in a neuromuscular junction.

Correct AnswerverifiedShow Answer

Recruitment refers to increasing the number of motor units involved in a muscle contraction.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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Compared to skeletal muscle, smooth muscle contracts and relaxes .

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Consider the components of the lever that causes the flexion of the upper limb at the elbow. The fulcrum of the lever is the and the force to move the rigid bar (the forearm bones) is provided by contraction of the .

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