Question 1

In the initiation ofmuscle contraction, calcium ions bind totropomyosin, exposing active sites on actin for cross-bridge formation.

Accepted Answer

A) True 
 B)False

Question 2

What enzyme catalyzes the breakdown of the neurotransmitter used to stimulate skeletal muscle?

Accepted Answer

A)   Tropomyosin
B)   ATPase
C)   Acetylcholinesterase
D)   NorephinephrineE) C) and D)
F) B) and D)

Question 3

What type of smooth muscle consists of muscle fibers that are separate rather than organized into sheets?

Accepted Answer

A)   Multiunit smooth muscle
B)   Visceral smooth muscle
C)   Skeletal muscle
D)   Cardiac muscleE) A) and D)
F) A) and C)

Question 4

An isotonic contraction is one that involves a change in length but not a change in tension.

Accepted Answer

A) True 
 B)False

Question 5

Which two muscles share the same primary action?

Accepted Answer

A)   Temporalis and masseter
B)   Levator scapulae and pectoralis minor
C)   Supinator and pronator teres
D)   Biceps femoris and rectus femorisE) B) and C)
F) All of the above

Question 6

If frequency of stimulation to a muscle fiber is increased, the force of contraction will increase.

Accepted Answer

A) True 
 B)False

Question 7

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

Question 8

What is peristalsis?

Accepted Answer

A)   A single contraction in response to a single stimulus of a muscle fiber
B)   A sustained contraction of a muscle fiber
C)   Wavelike smooth muscle contraction
D)   Contraction of progressively more motor units as stimulation strength increases
E)   The smallest strength of stimulus that will trigger a contraction of skeletal muscle fibersF) C) and D)
G) All of the above

Question 9

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) A) and C)

Question 10

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

Question 11

Muscle fatigue results from a combination of insufficient calcium and an excessof acetylcholine.

Accepted Answer

A) True 
 B)False

Question 12

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 13

Which muscles share the same primary action?

Accepted Answer

A)   Gluteus maximus and iliacus
B)   Gastrocnemius and soleus
C)   Zygomaticus and platysma
D)   Brachialis and triceps brachiiE) A) and D)
F) C) and D)

Question 14

What is peristalsis?

Accepted Answer

A)   A single contraction in response to a single stimulus of a muscle fiber
B)   A sustained contraction of a muscle fiber
C)   Wavelike smooth muscle contraction
D)   Contraction of progressively more motor units as stimulation strength increases
E)   The smallest strength of stimulus that will trigger a contraction of skeletal muscle fibersF) A) and B)
G) None of the above

Question 15

What muscle can act as a prime mover for plantar flexion of the foot?

Accepted Answer

A)   Gastrocnemius
B)   Tibialis anterior
C)   Extensor digitorum longus
D)   Biceps femorisE) A) and D)
F) A) and C)

Question 16

In muscle anatomy, what is an origin?

Accepted Answer

A)   The less movable end of a muscle
B)   The more movable end of the muscle
C)   The point of attachment of a tendon to a muscle
D)   The location of a neuromuscular junction
E)   The boundary between neighboring sarcomeresF) A) and B)
G) All of the above

Question 17

Intercalated discs are found in skeletal muscle and cardiac muscle, but are not present in smooth muscle.

Accepted Answer

A) True 
 B)False

Question 18

What is a description of the region known as the motor end plate?

Accepted Answer

A)   It has many openings leading into transverse tubules.
B)   Mitochondria are abundant.
C)   Synaptic vesicles are abundant.
D)   It functions to release neurotransmitter molecules.E) A) and B)
F) C) and D)

Question 19

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 20

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

Exam 8: Muscular System

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

Correct AnswerverifiedShow Answer

Which two muscles share the same primary action?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

What enzyme catalyzes the breakdown of the neurotransmitter used to stimulate skeletal muscle?

Correct AnswerverifiedShow Answer

What muscle can act as a prime mover for plantar flexion of the foot?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

What is the action of the enzyme acetylcholinesterase?

Correct AnswerverifiedShow Answer

Muscle fatigue results from a combination of insufficient calcium and an excessof acetylcholine.

Correct AnswerverifiedShow Answer

In muscle anatomy, what is an origin?

Correct AnswerverifiedShow Answer

Which muscles share the same primary action?

Correct AnswerverifiedShow Answer

In the initiation ofmuscle contraction, calcium ions bind totropomyosin, exposing active sites on actin for cross-bridge formation.

Correct AnswerverifiedShow Answer

What is peristalsis?

Correct AnswerverifiedShow Answer

What type of smooth muscle consists of muscle fibers that are separate rather than organized into sheets?

Correct AnswerverifiedShow Answer

If frequency of stimulation to a muscle fiber is increased, the force of contraction will increase.

Correct AnswerverifiedShow Answer

An isotonic contraction is one that involves a change in length but not a change in tension.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

What is a description of the region known as the motor end plate?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

What is peristalsis?

Correct AnswerverifiedShow Answer

Intercalated discs are found in skeletal muscle and cardiac muscle, but are not present in smooth muscle.

Correct AnswerverifiedShow Answer

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