Question 1

The enzyme that is partly responsible for shutting down a muscle contraction is ________.

Accepted Answer

A)  actinin 
B)  actinase 
C)  acetylcholinesterase 
D)  titin 
E)  glycolytic enzyme 
A)  actinin 
B)  actinase 
C)  acetylcholinesterase 
D)  titin 
E)  glycolytic enzyme C

Question 2

Which of the following is/are properties of a lever?

Accepted Answer

A)  It is a flexible structure. 
B)  It is the effort produced by the muscle contraction. 
C)  It moves on a fulcrum. 
D)  It is the weight that opposes the applied force. 
E)  All of the answers are correct. 
A)  It is a flexible structure. 
B)  It is the effort produced by the muscle contraction. 
C)  It moves on a fulcrum. 
D)  It is the weight that opposes the applied force. 
E)  All of the answers are correct. C

Question 3

A very good sprinter is likely to have ________.

Accepted Answer

A)  more slow twitch fibers than average 
B)  more intermediate fibers than average 
C)  more fast twitch fibers than average 
D)  average muscles; performance is based solely on training 
E)  None of the answers are correct. 
A)  more slow twitch fibers than average 
B)  more intermediate fibers than average 
C)  more fast twitch fibers than average 
D)  average muscles; performance is based solely on training 
E)  None of the answers are correct. C

Question 4

A skeletal muscle is divided into a series of internal compartments, each of which contains a bundle of muscle fibers called a ________.

Accepted Answer

A)  myofibril 
B)  sarcomere 
C)  triad 
D)  cross-bridge 
E)  fascicle 
A)  myofibril 
B)  sarcomere 
C)  triad 
D)  cross-bridge 
E)  fascicle

Question 5

How many skeletal muscles are there in the muscular system?

Accepted Answer

A)  50 
B)  206 
C)  thousands 
D)  700+ 
E)  116 
A)  50 
B)  206 
C)  thousands 
D)  700+ 
E)  116

Question 6

Between the endomysium and the muscle fibers lie a number of stem cells that aid in the repair of damaged muscle tissues. These are the ________ cells.

Accepted Answer

A)  myoblast 
B)  myofibril 
C)  isotropic 
D)  myosatellite 
E)  myosin 
A)  myoblast 
B)  myofibril 
C)  isotropic 
D)  myosatellite 
E)  myosin

Question 7

If a muscle has a tendon that branches within the muscle tissue, it is a ________.

Accepted Answer

A)  sphincter muscle 
B)  parallel muscle 
C)  circular muscle 
D)  multipennate muscle 
E)  None of the answers are correct. 
A)  sphincter muscle 
B)  parallel muscle 
C)  circular muscle 
D)  multipennate muscle 
E)  None of the answers are correct.

Question 8

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 N.

Accepted Answer

A)  Myofibril 
B)  Muscle fascicle 
C)  Muscle fiber 
D)  Myofilament 
E)  Sarcomere 
A)  Myofibril 
B)  Muscle fascicle 
C)  Muscle fiber 
D)  Myofilament 
E)  Sarcomere

Question 9

Muscle fibers can have various arrangements. The most powerful arrangement, in which more tension is generated during contraction, is called ________.

Accepted Answer

A)  circular 
B)  parallel 
C)  pennate 
D)  convergent 
E)  None of the answers are correct. 
A)  circular 
B)  parallel 
C)  pennate 
D)  convergent 
E)  None of the answers are correct.

Question 10

The steady increase in muscular tension produced by increasing the number of active motor units is called ________.

Accepted Answer

A)  muscle tone 
B)  a muscle twitch 
C)  muscle spindles 
D)  peak tension 
E)  recruitment 
A)  muscle tone 
B)  a muscle twitch 
C)  muscle spindles 
D)  peak tension 
E)  recruitment

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 J.

Accepted Answer

A)  Blood vessel 
B)  Nerve 
C)  Muscle fiber 
D)  Nucleus 
E)  Mitochondrion 
A)  Blood vessel 
B)  Nerve 
C)  Muscle fiber 
D)  Nucleus 
E)  Mitochondrion

Question 12

The connective tissue that surrounds each skeletal muscle fiber and binds each muscle fiber to its neighbor is the ________.

Accepted Answer

A)  endosteum 
B)  endomysium 
C)  epimysium 
D)  periosteum 
E)  perimysium 
A)  endosteum 
B)  endomysium 
C)  epimysium 
D)  periosteum 
E)  perimysium

Question 13

Skeletal muscle fiber contractions are caused by the interaction between the ________ and the ________ filaments of the sarcomeres.

Accepted Answer

A)  thin; nebulin 
B)  titin; thin 
C)  thick; nebulin 
D)  thin; thick 
E)  titin; thick 
A)  thin; nebulin 
B)  titin; thin 
C)  thick; nebulin 
D)  thin; thick 
E)  titin; thick

Question 14

A bundle of muscle fibers within a skeletal muscle body is called a ________.

Accepted Answer

A)  fascicle 
B)  perimysium 
C)  muscle sheath 
D)  myofiber 
E)  myofilament 
A)  fascicle 
B)  perimysium 
C)  muscle sheath 
D)  myofiber 
E)  myofilament

Question 15

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 G.

Accepted Answer

A)  Zone of overlap 
B)  Z discs 
C)  M line 
D)  A band 
E)  I band 
A)  Zone of overlap 
B)  Z discs 
C)  M line 
D)  A band 
E)  I band

Question 16

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 G.

Accepted Answer

A)  Myofibril 
B)  Muscle fascicle 
C)  Glial cell 
D)  Mitochondrion 
E)  Muscle fiber 
A)  Myofibril 
B)  Muscle fascicle 
C)  Glial cell 
D)  Mitochondrion 
E)  Muscle fiber

Question 17

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 T.

Accepted Answer

A)  Lysosomes 
B)  Synaptic vesicles 
C)  Peroxisomes 
D)  Nuclei 
E)  Lipid vesicles 
A)  Lysosomes 
B)  Synaptic vesicles 
C)  Peroxisomes 
D)  Nuclei 
E)  Lipid vesicles

Question 18

A muscle that assists a prime mover is an agonist.

Accepted Answer

A) True 
 B)False

Question 19

Most of the skeletal muscle fibers in the body are called ________ fibers, in reference to their duration of contraction following stimulation.

Accepted Answer

A)  red 
B)  intermediate 
C)  slow 
D)  fast 
E)  All of the answers are correct. 
A)  red 
B)  intermediate 
C)  slow 
D)  fast 
E)  All of the answers are correct.

Question 20

Which of the following ions is the trigger for a muscle contraction?

Accepted Answer

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

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

The enzyme that is partly responsible for shutting down a muscle contraction is ________.

Which of the following is/are properties of a lever?

A very good sprinter is likely to have ________.

A skeletal muscle is divided into a series of internal compartments, each of which contains a bundle of muscle fibers called a ________.

How many skeletal muscles are there in the muscular system?

Between the endomysium and the muscle fibers lie a number of stem cells that aid in the repair of damaged muscle tissues. These are the ________ cells.

If a muscle has a tendon that branches within the muscle tissue, it is a ________.

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 N.

Muscle fibers can have various arrangements. The most powerful arrangement, in which more tension is generated during contraction, is called ________.

The steady increase in muscular tension produced by increasing the number of active motor units is called ________.

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 J.

The connective tissue that surrounds each skeletal muscle fiber and binds each muscle fiber to its neighbor is the ________.

Skeletal muscle fiber contractions are caused by the interaction between the ________ and the ________ filaments of the sarcomeres.

A bundle of muscle fibers within a skeletal muscle body is called a ________.

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 G.

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 G.

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 T.

A muscle that assists a prime mover is an agonist.

Most of the skeletal muscle fibers in the body are called ________ fibers, in reference to their duration of contraction following stimulation.

Which of the following ions is the trigger for a muscle contraction?

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

Filters

Skeletal muscle fiber contractions are caused by the interaction between the and the filaments of the sarcomeres.