Question 1

The sliding mechanism of myofilaments works when ________.

Accepted Answer

A)  the thick filaments detach from the muscle tendon 
B)  the myosin heads of the thick filaments bind to active sites on the actin molecules of the thin filaments 
C)  the myosin heads pivot away from the M line toward the Z lines 
D)  the troponin-tropomyosin complex interacts with the actin molecules 
E)  calcium ions bind to active sites on the actin molecules of the thin filaments 
A)  the thick filaments detach from the muscle tendon 
B)  the myosin heads of the thick filaments bind to active sites on the actin molecules of the thin filaments 
C)  the myosin heads pivot away from the M line toward the Z lines 
D)  the troponin-tropomyosin complex interacts with the actin molecules 
E)  calcium ions bind to active sites on the actin molecules of the thin filaments

Question 2

The expanded portion of the axonal branch that faces a region of the sarcolemma is called an axon terminal.

Accepted Answer

A) True 
 B)False

Question 3

Figure 9.2
   
Using the diagram of a sarcomere, identify the specified labeled part in each of the following questions.
-Identify the specific structure indicated by Label A.

Accepted Answer

A)  Z disc 
B)  I band 
C)  M line 
D)  H band 
E)  A band 
A)  Z disc 
B)  I band 
C)  M line 
D)  H band 
E)  A band

Question 4

Slow twitch fibers appear red due to the intracellular storage of ________.

Accepted Answer

A)  nebulin 
B)  titin 
C)  hemoglobin 
D)  glycogen 
E)  myoglobin 
A)  nebulin 
B)  titin 
C)  hemoglobin 
D)  glycogen 
E)  myoglobin

Question 5

An intermediate fiber contracts fast, but it has more ________ and greater resistance to fatigue than a fast fiber.

Accepted Answer

A)  calcium ions 
B)  myoglobin 
C)  ribosomes 
D)  oxygen-binding pigments 
E)  mitochondria 
A)  calcium ions 
B)  myoglobin 
C)  ribosomes 
D)  oxygen-binding pigments 
E)  mitochondria

Question 6

Figure 9.4
   
Using the above-referenced figures depicting skeletal muscle fiber organization, identify the specific labeled part indicated in each of the following questions.
-Identify the specific structure indicated by Label B.

Accepted Answer

A)  Parallel muscle with tendinous bands 
B)  Deltoid muscle 
C)  Rectus femoris muscle 
D)  Bipennate muscle with extended tendon 
E)  Convergent muscle 
A)  Parallel muscle with tendinous bands 
B)  Deltoid muscle 
C)  Rectus femoris muscle 
D)  Bipennate muscle with extended tendon 
E)  Convergent muscle

Question 7

Figure 9.1
   
Using the diagrams of the structural organization of skeletal muscle, identify the specified labeled part in each of the following questions.
-Identify the specific structure indicated by Label S.

Accepted Answer

A)  Nucleus 
B)  Ribosome 
C)  Sarcoplasmic reticulum 
D)  Mitochondrion 
E)  Nerve 
A)  Nucleus 
B)  Ribosome 
C)  Sarcoplasmic reticulum 
D)  Mitochondrion 
E)  Nerve

Question 8

Why does a person with muscles that have a higher percentage of slow fibers have greater endurance than a person with muscles that have a lower percentage of slow fibers?

Accepted Answer

A person with more slow fibers in a part

Question 9

The biceps brachii is an example of a muscle with its fascicle oriented in a ________ fashion.

Accepted Answer

A)  convergent 
B)  parallel 
C)  bipennate 
D)  circular 
E)  multipennate 
A)  convergent 
B)  parallel 
C)  bipennate 
D)  circular 
E)  multipennate

Question 10

When viewed under polarized light, the dark staining bands are the A bands.

Accepted Answer

A) True 
 B)False

Question 11

Figure 9.1
   
Using the diagrams of the structural organization of skeletal muscle, identify the specified labeled part in each of the following questions.
-Identify the specific structure indicated by Label X.

Accepted Answer

A)  Mitochondria 
B)  Axons 
C)  Golgi apparatus 
D)  Myofibrils 
E)  Sarcoplasmic reticulum 
A)  Mitochondria 
B)  Axons 
C)  Golgi apparatus 
D)  Myofibrils 
E)  Sarcoplasmic reticulum

Question 12

Two factors that are used to determine the classification of a skeletal muscle are
(1)the arrangement of the muscle fibers.
(2)the structural arrangement relative to the direction of the pull.
(3)the overall size of the muscle.
(4)the amount of connective tissue present within the muscle.
(5)the number of tendons connected to the muscle.

Accepted Answer

A)  1 and 2 
B)  2 and 3 
C)  3 and 4 
D)  4 and 5 
E)  1 and 3 
A)  1 and 2 
B)  2 and 3 
C)  3 and 4 
D)  4 and 5 
E)  1 and 3

Question 13

While wearing a cast due to a broken bone, muscles shrink due to the process of ________.

Accepted Answer

A)  recruitment 
B)  cell division 
C)  hypertrophy 
D)  atrophy 
E)  chronic inflammation, or swelling 
A)  recruitment 
B)  cell division 
C)  hypertrophy 
D)  atrophy 
E)  chronic inflammation, or swelling

Question 14

What symptoms accompany fibromyalgia?

Accepted Answer

A)  temporomandibular joint disorder 
B)  irritable bowel syndrome 
C)  anxiety 
D)  tension headaches 
E)  All of the answers are correct. 
A)  temporomandibular joint disorder 
B)  irritable bowel syndrome 
C)  anxiety 
D)  tension headaches 
E)  All of the answers are correct.

Question 15

Actinin molecules form an open meshwork at the ________.

Accepted Answer

A)  Z line 
B)  M line 
C)  H band 
D)  I band 
E)  A band 
A)  Z line 
B)  M line 
C)  H band 
D)  I band 
E)  A band

Question 16

Which of the following events occurs first?

Accepted Answer

A)  Myosin cross-bridges attach to actin. 
B)  Calcium ions are released from the sarcoplasmic reticulum. 
C)  Calcium binds to troponin. 
D)  The myosin head pivots toward the M line. 
E)  The myosin head binds ATP and detaches from actin. 
A)  Myosin cross-bridges attach to actin. 
B)  Calcium ions are released from the sarcoplasmic reticulum. 
C)  Calcium binds to troponin. 
D)  The myosin head pivots toward the M line. 
E)  The myosin head binds ATP and detaches from actin.

Question 17

When a single motor neuron controls a greater number of muscle fibers in a motor unit, ________.

Accepted Answer

A)  the greater the number of stimuli will be required to produce a contraction 
B)  each contraction will last longer 
C)  the muscle contraction will be slower 
D)  the less precise the control will be 
E)  None of the answers are correct. 
A)  the greater the number of stimuli will be required to produce a contraction 
B)  each contraction will last longer 
C)  the muscle contraction will be slower 
D)  the less precise the control will be 
E)  None of the answers are correct.

Question 18

Figure 9.3
   
Using the diagrams depicting different views of the neuromuscular synapse, identify the specified labeled part in each of the following questions.
-Identify the specific structure indicated by Label Q.

Accepted Answer

A)  Acetylcholine molecules 
B)  Calcium ions 
C)  Glycogen 
D)  ATP molecules 
E)  Acetylcholinesterase molecules 
A)  Acetylcholine molecules 
B)  Calcium ions 
C)  Glycogen 
D)  ATP molecules 
E)  Acetylcholinesterase molecules

Question 19

Skeletal muscle fibers arise from embryonic cells called ________.

Accepted Answer

A)  myotomes 
B)  myoblasts 
C)  myomeres 
D)  myofilaments 
E)  myofibrils 
A)  myotomes 
B)  myoblasts 
C)  myomeres 
D)  myofilaments 
E)  myofibrils

Question 20

Figure 9.2
   
Using the diagram of a sarcomere, identify the specified labeled part in each of the following questions.
-Identify the specific structure indicated by Label E.

Accepted Answer

A)  Z line 
B)  I band 
C)  M line 
D)  Triad 
E)  Titin 
A)  Z line 
B)  I band 
C)  M line 
D)  Triad 
E)  Titin

Exam 9: The Muscular System: Skeletal Muscle Tissue and Muscle Organization

The sliding mechanism of myofilaments works when ________.

The expanded portion of the axonal branch that faces a region of the sarcolemma is called an axon terminal.

Figure 9.2 Using the diagram of a sarcomere, identify the specified labeled part in each of the following questions. -Identify the specific structure indicated by Label A.

Slow twitch fibers appear red due to the intracellular storage of ________.

An intermediate fiber contracts fast, but it has more ________ and greater resistance to fatigue than a fast fiber.

Figure 9.4 Using the above-referenced figures depicting skeletal muscle fiber organization, identify the specific labeled part indicated in each of the following questions. -Identify the specific structure indicated by Label B.

Figure 9.1 Using the diagrams of the structural organization of skeletal muscle, identify the specified labeled part in each of the following questions. -Identify the specific structure indicated by Label S.

Why does a person with muscles that have a higher percentage of slow fibers have greater endurance than a person with muscles that have a lower percentage of slow fibers?

The biceps brachii is an example of a muscle with its fascicle oriented in a ________ fashion.

When viewed under polarized light, the dark staining bands are the A bands.

Figure 9.1 Using the diagrams of the structural organization of skeletal muscle, identify the specified labeled part in each of the following questions. -Identify the specific structure indicated by Label X.

While wearing a cast due to a broken bone, muscles shrink due to the process of ________.

What symptoms accompany fibromyalgia?

Actinin molecules form an open meshwork at the ________.

Which of the following events occurs first?

When a single motor neuron controls a greater number of muscle fibers in a motor unit, ________.

Figure 9.3 Using the diagrams depicting different views of the neuromuscular synapse, identify the specified labeled part in each of the following questions. -Identify the specific structure indicated by Label Q.

Skeletal muscle fibers arise from embryonic cells called ________.

Figure 9.2 Using the diagram of a sarcomere, identify the specified labeled part in each of the following questions. -Identify the specific structure indicated by Label E.

Foundations: An Introduction to Anatomy

Foundations: The Cell

Foundations: Tissues and Early Embryology

The Integumentary System

The Skeletal System: Osseous Tissue and Skeletal Structure

The Skeletal System: Axial Division

The Skeletal System: Appendicular Division

The Skeletal System: Articulations

The Muscular System: Axial Musculature

The Muscular System: Appendicular Musculature

Surface Anatomy and Cross-Sectional Anatomy

The Nervous System: Neural Tissue

The Nervous System: The Spinal Cord and Spinal Nerves

The Nervous System: Sensory and Motor Tracts of the Spinal Cord

The Nervous System: The Brain and Cranial Nerves

The Nervous System: Autonomic Nervous System

The Nervous System: General and Special Senses

The Endocrine System

The Cardiovascular System: Blood

The Cardiovascular System: The Heart

The Cardiovascular System: Vessels and Circulation

The Lymphatic System

The Respiratory System

The Digestive System

The Urinary System

The Reproductive System

Embryology and Human Development

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