Question 1

Figure 7-1 Structural Components of a Skeletal Muscle Fiber
Use Figure 7-1 to identify the labeled part.
-Structure B

Accepted Answer

A)  protects the myofibrils. 
B)  attaches to actin molecules. 
C)  produces ATP. 
D)  conducts nerve impulses through the muscle cell. 
E)  stores calcium. 
A)  protects the myofibrils. 
B)  attaches to actin molecules. 
C)  produces ATP. 
D)  conducts nerve impulses through the muscle cell. 
E)  stores calcium. E

Question 2

Which of the following describes the action of the trapezius?

Accepted Answer

A)  adducts the spine 
B)  adducts and flexes the humerus 
C)  elevates, adducts, depresses, or rotates the scapula 
D)  provides medial rotation of the head 
E)  provides lateral rotation of the humerus 
A)  adducts the spine 
B)  adducts and flexes the humerus 
C)  elevates, adducts, depresses, or rotates the scapula 
D)  provides medial rotation of the head 
E)  provides lateral rotation of the humerus C

Question 3

Which of the following occurs when tension production rises to a peak and very brief periods of relaxation occur?

Accepted Answer

A)  resting period 
B)  latency 
C)  tension plateau 
D)  incomplete tetanus 
E)  complete tetanus 
A)  resting period 
B)  latency 
C)  tension plateau 
D)  incomplete tetanus 
E)  complete tetanus D

Question 4

Place these steps of muscle contraction in the correct order. 1.Action potential is generated along the sarcolemma
2)Nerve impulse arrives at synapse
3)Calcium is released into muscle cell cytoplasm
4)Acetylcholine is produced
5)Actin and myosin molecules continuously cross-link,with actin molecules being pulled inward

Accepted Answer

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

Question 5

What is the function of the transverse tubule?

Accepted Answer

A)  the storage of calcium ions 
B)  to transmit electrical impulses to the cell's interior 
C)  to store sodium ions 
D)  to allow cross-bridge attachment 
E)  to produce myofibrils 
A)  the storage of calcium ions 
B)  to transmit electrical impulses to the cell's interior 
C)  to store sodium ions 
D)  to allow cross-bridge attachment 
E)  to produce myofibrils

Question 6

The striated appearance of skeletal muscle results from

Accepted Answer

A)  the transverse tubule pattern. 
B)  the sarcoplasmic reticulum. 
C)  cisternae placement. 
D)  actin and myosin arrangement. 
E)  the perimysium arrangement. 
A)  the transverse tubule pattern. 
B)  the sarcoplasmic reticulum. 
C)  cisternae placement. 
D)  actin and myosin arrangement. 
E)  the perimysium arrangement.

Question 7

Figure 7-1 Structural Components of a Skeletal Muscle Fiber
Use Figure 7-1 to identify the labeled part.
-Structure I is composed of

Accepted Answer

A)  actin and perimysium. 
B)  actin and myosin. 
C)  troponin and tropomyosin. 
D)  only myosin heads. 
E)  acetylcholine and cholinesterase. 
A)  actin and perimysium. 
B)  actin and myosin. 
C)  troponin and tropomyosin. 
D)  only myosin heads. 
E)  acetylcholine and cholinesterase.

Question 8

Which of the following is an accurate characteristic of slow fibers?

Accepted Answer

A)  Slow muscle tissue has a much less extensive network of capillaries than does typical fast muscle tissue. 
B)  Resting slow muscle fibers contain oxygen reserves, bound to myoglobin. 
C)  Slow muscle tissue has a lower oxygen supply than does fast muscle tissue. 
D)  Slow muscle fibers contain fewer mitochondria than do fast muscle fibers. 
E)  Slow muscle fibers contain myoglobin, a globular protein, which binds sodium. 
A)  Slow muscle tissue has a much less extensive network of capillaries than does typical fast muscle tissue. 
B)  Resting slow muscle fibers contain oxygen reserves, bound to myoglobin. 
C)  Slow muscle tissue has a lower oxygen supply than does fast muscle tissue. 
D)  Slow muscle fibers contain fewer mitochondria than do fast muscle fibers. 
E)  Slow muscle fibers contain myoglobin, a globular protein, which binds sodium.

Question 9

In response to action potentials arriving from the transverse tubules,the sarcoplasmic reticulum releases

Accepted Answer

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

Question 10

Nonstriated,involuntary muscle is

Accepted Answer

A)  cardiac. 
B)  red skeletal. 
C)  smooth. 
D)  white skeletal. 
E)  intermediate skeletal. 
A)  cardiac. 
B)  red skeletal. 
C)  smooth. 
D)  white skeletal. 
E)  intermediate skeletal.

Question 11

The active sites on actin molecules are usually covered up by other molecules.What is the critical material required to uncover the active sites on the actin molecules that will then bind to myosin heads?

Accepted Answer

A)  ATP 
B)  calcium 
C)  oxygen 
D)  vitamin A 
E)  titin 
A)  ATP 
B)  calcium 
C)  oxygen 
D)  vitamin A 
E)  titin

Question 12

Which of the following statements describes how muscles help maintain homeostasis?

Accepted Answer

A)  The contractions of skeletal muscles pull on tendons and move elements of the skeleton. 
B)  Skeletal muscles are responsible for guarding the openings of the digestive and urinary tracts. 
C)  Skeletal muscles are responsible for the pumping action of the heart. 
D)  Skeletal muscles support the weight of some internal organs. 
E)  Skeletal muscle contractions help maintain body temperature. 
A)  The contractions of skeletal muscles pull on tendons and move elements of the skeleton. 
B)  Skeletal muscles are responsible for guarding the openings of the digestive and urinary tracts. 
C)  Skeletal muscles are responsible for the pumping action of the heart. 
D)  Skeletal muscles support the weight of some internal organs. 
E)  Skeletal muscle contractions help maintain body temperature.

Question 13

Which statement regarding isometric contractions is true?

Accepted Answer

A)  Tension rises during a contraction. 
B)  The skeletal muscle's length changes. 
C)  The tension produced never exceeds the load. 
D)  Tension remains at a constant level until relaxation occurs. 
E)  Examples are walking and running. 
A)  Tension rises during a contraction. 
B)  The skeletal muscle's length changes. 
C)  The tension produced never exceeds the load. 
D)  Tension remains at a constant level until relaxation occurs. 
E)  Examples are walking and running.

Question 14

Which statement regarding the relaxation phase of a muscle twitch is true?

Accepted Answer

A)  The phase begins at stimulation and typically lasts about two milliseconds. 
B)  Muscle tension falls to resting levels. 
C)  The action potential sweeps across the sarcomere during this period. 
D)  Tension rises to a peak. 
E)  Cross-bridges are interacting with active sites on actin filaments throughout this period. 
A)  The phase begins at stimulation and typically lasts about two milliseconds. 
B)  Muscle tension falls to resting levels. 
C)  The action potential sweeps across the sarcomere during this period. 
D)  Tension rises to a peak. 
E)  Cross-bridges are interacting with active sites on actin filaments throughout this period.

Question 15

A muscle ________ contains a sarcolemma,sarcoplasm,myofilaments,and myofibrils.

Accepted Answer

A)  fiber 
B)  intercalated disc 
C)  T-tubule 
D)  myofibril 
E)  motor end plate 
A)  fiber 
B)  intercalated disc 
C)  T-tubule 
D)  myofibril 
E)  motor end plate

Question 16

The muscle that inserts on the iliotibial tract and gluteal tuberosity of the femur is the

Accepted Answer

A)  gracilis. 
B)  sartorius. 
C)  rectus femoris. 
D)  gluteus medius. 
E)  gluteus maximus. 
A)  gracilis. 
B)  sartorius. 
C)  rectus femoris. 
D)  gluteus medius. 
E)  gluteus maximus.

Question 17

The term used to describe muscular growth in response to usage is

Accepted Answer

A)  multiple sclerosis. 
B)  muscular dystrophy. 
C)  atrophy. 
D)  hypertrophy. 
E)  myopathy. 
A)  multiple sclerosis. 
B)  muscular dystrophy. 
C)  atrophy. 
D)  hypertrophy. 
E)  myopathy.

Question 18

Tom is having difficulty dorsiflexing and inverting his right foot.Which muscle is most likely involved in this problem?

Accepted Answer

A)  tibialis anterior 
B)  soleus 
C)  gastrocnemius 
D)  flexor digitorum 
E)  plantaris 
A)  tibialis anterior 
B)  soleus 
C)  gastrocnemius 
D)  flexor digitorum 
E)  plantaris

Question 19

The area of the sarcomere that is the light region between two successive A-bands is the

Accepted Answer

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

Question 20

Muscle cells

Accepted Answer

A)  actively lengthen. 
B)  generate compression. 
C)  possess a mechanism that regulates the tension amount by changing the number of contracting sarcomeres. 
D)  vary tension production based on the amount of sodium ions bound to actin. 
E)  can only contract. 
A)  actively lengthen. 
B)  generate compression. 
C)  possess a mechanism that regulates the tension amount by changing the number of contracting sarcomeres. 
D)  vary tension production based on the amount of sodium ions bound to actin. 
E)  can only contract.

Figure 7-1 Structural Components of a Skeletal Muscle Fiber Use Figure 7-1 to identify the labeled part. -Structure B

Which of the following describes the action of the trapezius?

Which of the following occurs when tension production rises to a peak and very brief periods of relaxation occur?

What is the function of the transverse tubule?

The striated appearance of skeletal muscle results from

Figure 7-1 Structural Components of a Skeletal Muscle Fiber Use Figure 7-1 to identify the labeled part. -Structure I is composed of

Which of the following is an accurate characteristic of slow fibers?

In response to action potentials arriving from the transverse tubules,the sarcoplasmic reticulum releases

Nonstriated,involuntary muscle is

The active sites on actin molecules are usually covered up by other molecules.What is the critical material required to uncover the active sites on the actin molecules that will then bind to myosin heads?

Which of the following statements describes how muscles help maintain homeostasis?

Which statement regarding isometric contractions is true?

Which statement regarding the relaxation phase of a muscle twitch is true?

A muscle ________ contains a sarcolemma,sarcoplasm,myofilaments,and myofibrils.

The muscle that inserts on the iliotibial tract and gluteal tuberosity of the femur is the

The term used to describe muscular growth in response to usage is

Tom is having difficulty dorsiflexing and inverting his right foot.Which muscle is most likely involved in this problem?

The area of the sarcomere that is the light region between two successive A-bands is the

Muscle cells

An Introduction to Anatomy and Physiology

The Chemical Level of Organization

Cell Structure and Function

The Tissue Level of Organization

The Integumentary System

The Skeletal System

The Nervous System

The General and Special Senses

The Endocrine System

The Cardiovascular System: Blood

The Cardiovascular System: The Heart

The Cardiovascular System: Blood Vessels and Circulation

The Lymphatic System and Immunity

The Respiratory System

The Digestive System

Metabolism and Energetics

The Urinary System

The Reproductive System

Development and Inheritance

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Exam 7: The Muscular System

Figure 7-1 Structural Components of a Skeletal Muscle Fiber Use Figure 7-1 to identify the labeled part. -Structure B

Which of the following describes the action of the trapezius?

Which of the following occurs when tension production rises to a peak and very brief periods of relaxation occur?

What is the function of the transverse tubule?

The striated appearance of skeletal muscle results from

Figure 7-1 Structural Components of a Skeletal Muscle Fiber Use Figure 7-1 to identify the labeled part. -Structure I is composed of

Which of the following is an accurate characteristic of slow fibers?

In response to action potentials arriving from the transverse tubules,the sarcoplasmic reticulum releases

Nonstriated,involuntary muscle is

The active sites on actin molecules are usually covered up by other molecules.What is the critical material required to uncover the active sites on the actin molecules that will then bind to myosin heads?

Which of the following statements describes how muscles help maintain homeostasis?

Which statement regarding isometric contractions is true?

Which statement regarding the relaxation phase of a muscle twitch is true?

A muscle ________ contains a sarcolemma,sarcoplasm,myofilaments,and myofibrils.

The muscle that inserts on the iliotibial tract and gluteal tuberosity of the femur is the

The term used to describe muscular growth in response to usage is

Tom is having difficulty dorsiflexing and inverting his right foot.Which muscle is most likely involved in this problem?

The area of the sarcomere that is the light region between two successive A-bands is the

Muscle cells

An Introduction to Anatomy and Physiology

The Chemical Level of Organization

Cell Structure and Function

The Tissue Level of Organization

The Integumentary System

The Skeletal System

The Nervous System

The General and Special Senses

The Endocrine System

The Cardiovascular System: Blood

The Cardiovascular System: The Heart

The Cardiovascular System: Blood Vessels and Circulation

The Lymphatic System and Immunity

The Respiratory System

The Digestive System

Metabolism and Energetics

The Urinary System

The Reproductive System

Development and Inheritance

Filters