Question 1

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)  acetylcholinesterase 
A)  potassium 
B)  sodium 
C)  calcium 
D)  acetylcholine 
E)  acetylcholinesterase

Question 2

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

Question 3

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 femoris 
A)  Temporalis and masseter 
B)  Levator scapulae and pectoralis minor 
C)  Supinator and pronator teres 
D)  Biceps femoris and rectus femoris

Question 4

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

Accepted Answer

A)  neurotransmitters 
B)  proteins 
C)  myosin 
D)  troponin 
E)  tropomyosin 
A)  neurotransmitters 
B)  proteins 
C)  myosin 
D)  troponin 
E)  tropomyosin

Question 5

Enlarged portions of the sarcoplasmic reticulum are called __________.

Accepted Answer

A)  synaptic clefts 
B)  cisternae 
C)  H zones 
D)  T tubules 
E)  motor end plates 
A)  synaptic clefts 
B)  cisternae 
C)  H zones 
D)  T tubules 
E)  motor end plates

Question 6

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 acetylcholinesterase 
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 acetylcholinesterase

Question 7

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. 
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.

Question 8

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

Accepted Answer

A) True 
 B)False

Question 9

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)  Recruitment 
A)  Muscle fatigue 
B)  Complete tetaniccontraction 
C)  Summation 
D)  Peristalsis 
E)  Recruitment

Question 10

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)  sarcoplasm 
A)  synaptic cleft 
B)  T tubule 
C)  motor end plate 
D)  synaptic vesicle 
E)  sarcoplasm

Question 11

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 cell 
A)  Cardiac muscle cell 
B)  Skeletal muscle cell 
C)  Smooth muscle cell

Question 12

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 junction 
A)  Motor end plate 
B)  Synaptic cleft 
C)  Synaptic vesicle 
D)  Junctional plate 
E)  Neuromuscular junction

Question 13

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)  epimysium 
A)  origin 
B)  insertion 
C)  tendon 
D)  ligament 
E)  epimysium

Question 14

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 withstand 
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 withstand

Question 15

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. 
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.

Question 16

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 withstand 
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 withstand

Question 17

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 lactate 
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 lactate

Question 18

What is a sarcomere?

Accepted Answer

A)  Part of the sarcoplasmic reticulum 
B)  Group of fascicles 
C)  Group of myofibrils 
D)  Unit within a myofibril 
A)  Part of the sarcoplasmic reticulum 
B)  Group of fascicles 
C)  Group of myofibrils 
D)  Unit within a myofibril

Question 19

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)  Handle 
A)  Rigid bar 
B)  Fulcrum 
C)  Force 
D)  Resistance 
E)  Handle

Question 20

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

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

What is an action of the rectus femoris muscle?

Which two muscles share the same primary action?

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

Enlarged portions of the sarcoplasmic reticulum are called __________.

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

What statement describes the zygomaticusmuscle?

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

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?

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

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

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

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

What is a threshold stimulus?

How is creatine phosphate used by muscle cells?

What is a threshold stimulus?

What is oxygen debt?

What is a sarcomere?

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

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

Introduction to Human Anatomy and Physiology

Chemical Basis of Life

Cells

Cellular Metabolism

Tissues

Integumentary System

Skeletal System

Pregnancy, Growth, Development, and Genetics

Nervous System

The Senses

Endocrine System

Blood

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Lymphatic System and Immunity

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Exam 8: Muscular System

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

What is an action of the rectus femoris muscle?

Which two muscles share the same primary action?

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

Enlarged portions of the sarcoplasmic reticulum are called __________.

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

What statement describes the zygomaticusmuscle?

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

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?

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

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

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

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

What is a threshold stimulus?

How is creatine phosphate used by muscle cells?

What is a threshold stimulus?

What is oxygen debt?

What is a sarcomere?

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

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

Introduction to Human Anatomy and Physiology

Chemical Basis of Life

Cells

Cellular Metabolism

Tissues

Integumentary System

Skeletal System

Pregnancy, Growth, Development, and Genetics

Nervous System

The Senses

Endocrine System

Blood

Cardiovascular System

Lymphatic System and Immunity

Digestion and Nutrition

Respiratory System

Urinary System

Water, Electrolyte, and Acid-Base Balance

Reproductive Systems

Filters