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

Question 2

What is a threshold stimulus?

Accepted Answer

A)   Minimum strength of stimulus required to cause muscle fiber contraction to occur
B)   Maximal amount of force a muscle can exert
C)   Amount of oxygen needed for repeated contractions
D)   Minimal amount of force a muscle can exert
E)   Maximal amount of stimulation a muscle can withstandF) C) and E)
G) B) and D)

Question 3

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

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

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) None of the above
E) B) and C)

Question 6

What is oxygen debt?

Accepted Answer

A)   The oxygen needed to oxidize one molecule of glucose during aerobic cellular respiration
B)   The oxygen needed after strenuous exercise to restore ATP and oxygen levels, and for liver cells to convert lactate to glucose
C)   The oxygen needed to begin a bout of strenuous exercise, starting from rest
D)   The oxygen needed to drive glycolysis in muscle and liver cells
E)   The oxygen needed to convert pyruvic acid to lactic acid to lactateF) None of the above
G) B) and C)

Question 7

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

Question 8

What statement describes the zygomaticusmuscle?

Accepted Answer

A)   It inserts on the coronoidprocess of the mandible.
B)   It elevates the corner of the mouth.
C)   It brings the head into an upright position.
D)   It closes the lips.E) None of the above
F) B) and D)

Question 9

Motor neurons communicate with muscle cells by releasing chemicals called ____________.

Accepted Answer

A)   neurotransmitters
B)   proteins
C)   myosin
D)   troponin
E)   tropomyosinF) C) and D)
G) A) and C)

Question 10

A(n)  __________ is a bundle of dense connective tissue that connects a skeletal muscle to a bone.

Accepted Answer

A)   origin
B)   insertion
C)   tendon
D)   ligament
E)   epimysiumF) B) and E)
G) B) and D)

Question 11

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 B)
G) C) and D)

Question 12

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

Question 13

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 B)
F) B) and C)

Question 14

What is a sarcomere?

Accepted Answer

A)   Part of the sarcoplasmic reticulum
B)   Group of fascicles
C)   Group of myofibrils
D)   Unit within a myofibrilE) B) and C)
F) None of the above

Question 15

What structure within a skeletal muscle cell extends from Z line to Z line?

Accepted Answer

A)   Sarcolemma
B)   Sarcomere
C)   Sarcoplasmic reticulum
D)   A band
E)   I bandF) A) and C)
G) B) and E)

Question 16

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) A) and D)
G) A) and C)

Question 17

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

Question 18

What is a threshold stimulus?

Accepted Answer

A)   Minimum strength of stimulus required to cause muscle fiber contraction to occur
B)   Maximal amount of force a muscle can exert
C)   Amount of oxygen needed for repeated contractions
D)   Minimal amount of force a muscle can exert
E)   Maximal amount of stimulation a muscle can withstandF) A) and D)
G) A) and C)

Question 19

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

Question 20

What is an action of the rectus femoris muscle?

Accepted Answer

A)   Extends leg at knee
B)   Plantar flexes the foot
C)   Extends the thigh at the hip
D)   Adducts the thighE) B) and C)
F) B) and D)

Exam 8: Muscular System

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

Correct AnswerverifiedShow Answer

What is a threshold stimulus?

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

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

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

Enlarged portions of the sarcoplasmic reticulum are called __________.

Correct AnswerverifiedShow Answer

Motor neurons communicate with muscle cells by releasing chemicals called ____________.

Correct AnswerverifiedShow Answer

Which two muscles share the same primary action?

Correct AnswerverifiedShow Answer

What is an action of the rectus femoris muscle?

Correct AnswerverifiedShow Answer

What is a threshold stimulus?

Correct AnswerverifiedShow Answer

How is creatine phosphate used by muscle cells?

Correct AnswerverifiedShow Answer

What structure within a skeletal muscle cell extends from Z line to Z line?

Correct AnswerverifiedShow Answer

What statement describes the zygomaticusmuscle?

Correct AnswerverifiedShow Answer

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

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

A(n) __________ is a bundle of dense connective tissue that connects a skeletal muscle to a bone.

Correct AnswerverifiedShow Answer

What is a sarcomere?

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

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

Correct AnswerverifiedShow Answer

What is oxygen debt?

Correct AnswerverifiedShow Answer

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