Question 1

After death, muscle fibers run out of ATP and calcium begins to leak from the sarcoplasmic reticulum into the sarcoplasm. This results in a condition known as

Accepted Answer

A)  tetany. 
B)  treppe. 
C)  depolarization. 
D)  rigor mortis. 
E)  oxygen debt. 
A)  tetany. 
B)  treppe. 
C)  depolarization. 
D)  rigor mortis. 
E)  oxygen debt.

Question 2

Describe the basic sequence of events that occurs as an action potential arrives at the neuromuscular junction and is transmitted to the muscle cell.

Accepted Answer

The action potential triggers the exocyt

Question 3

Thick filaments are made of the protein

Accepted Answer

A)  actin. 
B)  titin. 
C)  myosin. 
D)  tropomyosin. 
E)  nebulin. 
A)  actin. 
B)  titin. 
C)  myosin. 
D)  tropomyosin. 
E)  nebulin.

Question 4

The protein that regulates muscle contraction by controlling the availability of active sites on actin is called

Accepted Answer

A)  actin. 
B)  titin. 
C)  myosin. 
D)  tropomyosin. 
E)  nebulin. 
A)  actin. 
B)  titin. 
C)  myosin. 
D)  tropomyosin. 
E)  nebulin.

Question 5

Figure 10-1 Skeletal Muscle Fiber
  
Use Figure 10-1 to answer the following questions:
-Identify the structure(s) where ATP is consumed?

Accepted Answer

A)  3 
B)  6 
C)  3 and 6 
D)  7 
E)  3 and 7 
A)  3 
B)  6 
C)  3 and 6 
D)  7 
E)  3 and 7

Question 6

The area in the center of the A band that contains no thin filaments is the

Accepted Answer

A)  Z line. 
B)  M line. 
C)  H band. 
D)  I band. 
E)  zone of overlap. 
A)  Z line. 
B)  M line. 
C)  H band. 
D)  I band. 
E)  zone of overlap.

Question 7

The narrow space between the synaptic terminal and the muscle fiber is the

Accepted Answer

A)  synaptic knob. 
B)  motor end plate. 
C)  motor unit. 
D)  synaptic cleft. 
E)  M line. 
A)  synaptic knob. 
B)  motor end plate. 
C)  motor unit. 
D)  synaptic cleft. 
E)  M line.

Question 8

Which of the following allows muscles to return to their original shape during relaxation?

Accepted Answer

A)  gravity 
B)  opposing muscle contractions 
C)  elastic forces 
D)  myosin binding 
E)  gravity, opposing muscle contractions, and elastic forces 
A)  gravity 
B)  opposing muscle contractions 
C)  elastic forces 
D)  myosin binding 
E)  gravity, opposing muscle contractions, and elastic forces

Question 9

Which of the following statements about excitation-contraction coupling is incorrect?

Accepted Answer

A)  Calcium ions travel through the transverse tubule. 
B)  Calcium ion is released from the sarcoplasmic reticulum. 
C)  Tropomyosin moves to expose myosin binding sites on actin. 
D)  Troponin binds calcium ion and signals tropomyosin to move. 
E)  Relaxation requires uptake of calcium ion by the sarcoplasmic reticulum. 
A)  Calcium ions travel through the transverse tubule. 
B)  Calcium ion is released from the sarcoplasmic reticulum. 
C)  Tropomyosin moves to expose myosin binding sites on actin. 
D)  Troponin binds calcium ion and signals tropomyosin to move. 
E)  Relaxation requires uptake of calcium ion by the sarcoplasmic reticulum.

Question 10

Put the following structures in order from superficial to deep.
1) muscle fiber
2) perimysium
3) myofibril
4) fascicle
5) endomysium
6) epimysium

Accepted Answer

A)  1, 5, 4, 3, 2, 6 
B)  6, 2, 5, 4, 1, 3 
C)  6, 2, 4, 5, 1, 3 
D)  1, 3, 5, 6, 4, 2 
E)  2, 3, 1, 4, 6, 5 
A)  1, 5, 4, 3, 2, 6 
B)  6, 2, 5, 4, 1, 3 
C)  6, 2, 4, 5, 1, 3 
D)  1, 3, 5, 6, 4, 2 
E)  2, 3, 1, 4, 6, 5

Question 11

A muscle produces its highest tension when in complete

Accepted Answer

A)  recovery. 
B)  treppe. 
C)  wave summation. 
D)  aerobic metabolism. 
E)  tetanus. 
A)  recovery. 
B)  treppe. 
C)  wave summation. 
D)  aerobic metabolism. 
E)  tetanus.

Question 12

How would the loss of acetylcholinesterase from the motor end plate affect skeletal muscle?

Accepted Answer

A)  It would make the muscles less excitable. 
B)  It would produce muscle weakness. 
C)  It would cause muscles to stay contracted. 
D)  It would cause muscles to stay relaxed. 
E)  It would have little effect on skeletal muscles. 
A)  It would make the muscles less excitable. 
B)  It would produce muscle weakness. 
C)  It would cause muscles to stay contracted. 
D)  It would cause muscles to stay relaxed. 
E)  It would have little effect on skeletal muscles.

Question 13

Identify the incorrect statement about a single motor unit.

Accepted Answer

A)  The more neurons involved, the more powerful the contraction. 
B)  The smaller the number of muscle fibers, the more precise the movement. 
C)  Fine motor skills depend on the development of small motor units. 
D)  Some motor units include as many as 2000 muscle fibers. 
E)  Muscle fibers of one motor unit intermingle with the fibers of another motor unit. 
A)  The more neurons involved, the more powerful the contraction. 
B)  The smaller the number of muscle fibers, the more precise the movement. 
C)  Fine motor skills depend on the development of small motor units. 
D)  Some motor units include as many as 2000 muscle fibers. 
E)  Muscle fibers of one motor unit intermingle with the fibers of another motor unit.

Question 14

The structural theory that explains how a muscle fiber contracts is called the ________ theory.

Accepted Answer

A)  sliding filament 
B)  excitation-contraction coupling 
C)  neuromuscular 
D)  muscle contraction 
E)  action-myosin interaction 
A)  sliding filament 
B)  excitation-contraction coupling 
C)  neuromuscular 
D)  muscle contraction 
E)  action-myosin interaction

Question 15

Active sites become exposed when calcium ions bind to

Accepted Answer

A)  tropomyosin. 
B)  actin. 
C)  myosin. 
D)  troponin. 
E)  calcium channels. 
A)  tropomyosin. 
B)  actin. 
C)  myosin. 
D)  troponin. 
E)  calcium channels.

Question 16

When acetylcholine binds to receptors at the motor end plate, the sarcolemma becomes

Accepted Answer

A)  more permeable to sodium ions. 
B)  less permeable to sodium ions. 
C)  more permeable to calcium ions. 
D)  less permeable to potassium ions. 
E)  less permeable to potassium and sodium ions. 
A)  more permeable to sodium ions. 
B)  less permeable to sodium ions. 
C)  more permeable to calcium ions. 
D)  less permeable to potassium ions. 
E)  less permeable to potassium and sodium ions.

Question 17

Figure 10-1 Skeletal Muscle Fiber
  
Use Figure 10-1 to answer the following questions:
-What is released from the structure labeled "9"?

Accepted Answer

A)  sarcoplasm 
B)  acetylcholine 
C)  protein 
D)  calcium ions 
E)  acetylcholinesterase 
A)  sarcoplasm 
B)  acetylcholine 
C)  protein 
D)  calcium ions 
E)  acetylcholinesterase

Question 18

Figure 10-1 Skeletal Muscle Fiber
  
Use Figure 10-1 to answer the following questions:
-Where are the myosin molecules located?

Accepted Answer

A)  4 
B)  5 
C)  6 
D)  7 
E)  8 
A)  4 
B)  5 
C)  6 
D)  7 
E)  8

Question 19

The following is a list of the events that occur during a muscle contraction. What is the correct sequence of these events?
1) Myosin cross-bridges bind to the actin.
2) The free myosin head splits ATP.
3) Calcium ion is released from the sarcoplasmic reticulum.
4) The myosin head pivots toward the center of the sarcomere.
5) Calcium ion binds to troponin.
6) The myosin head binds an ATP molecule and detaches from the actin.

Accepted Answer

A)  1, 3, 5, 4, 6, 2 
B)  5, 1, 4, 6, 2, 3 
C)  3, 5, 1, 2, 4, 6 
D)  3, 5, 1, 4, 6, 2 
E)  1, 4, 6, 2, 3, 5 
A)  1, 3, 5, 4, 6, 2 
B)  5, 1, 4, 6, 2, 3 
C)  3, 5, 1, 2, 4, 6 
D)  3, 5, 1, 4, 6, 2 
E)  1, 4, 6, 2, 3, 5

Question 20

During the recovery period following exercise, all of the following are true except

Accepted Answer

A)  lactic acid is removed from muscle cells. 
B)  the muscle actively produces ATP. 
C)  muscle fibers are unable to contract. 
D)  oxygen is consumed at above the resting rate. 
E)  heat is generated. 
A)  lactic acid is removed from muscle cells. 
B)  the muscle actively produces ATP. 
C)  muscle fibers are unable to contract. 
D)  oxygen is consumed at above the resting rate. 
E)  heat is generated.

Exam 10: Muscle Tissue

After death, muscle fibers run out of ATP and calcium begins to leak from the sarcoplasmic reticulum into the sarcoplasm. This results in a condition known as

Describe the basic sequence of events that occurs as an action potential arrives at the neuromuscular junction and is transmitted to the muscle cell.

Thick filaments are made of the protein

The protein that regulates muscle contraction by controlling the availability of active sites on actin is called

Figure 10-1 Skeletal Muscle Fiber Use Figure 10-1 to answer the following questions: -Identify the structure(s) where ATP is consumed?

The area in the center of the A band that contains no thin filaments is the

The narrow space between the synaptic terminal and the muscle fiber is the

Which of the following allows muscles to return to their original shape during relaxation?

Which of the following statements about excitation-contraction coupling is incorrect?

Put the following structures in order from superficial to deep. 1) muscle fiber 2) perimysium 3) myofibril 4) fascicle 5) endomysium 6) epimysium

A muscle produces its highest tension when in complete

How would the loss of acetylcholinesterase from the motor end plate affect skeletal muscle?

Identify the incorrect statement about a single motor unit.

The structural theory that explains how a muscle fiber contracts is called the ________ theory.

Active sites become exposed when calcium ions bind to

When acetylcholine binds to receptors at the motor end plate, the sarcolemma becomes

Figure 10-1 Skeletal Muscle Fiber Use Figure 10-1 to answer the following questions: -What is released from the structure labeled "9"?

Figure 10-1 Skeletal Muscle Fiber Use Figure 10-1 to answer the following questions: -Where are the myosin molecules located?

During the recovery period following exercise, all of the following are true except

An Introduction to Anatomy and Physiology

The Chemical Level of Organization

The Cellular Level of Organization

The Tissue Level of Organization

The Integumentary System

Bones and Bone Structure

The Axial Skeleton

The Appendicular Skeleton

Joints

The Muscular System

Nervous Tissue

The Spinal Cord, Spinal Nerves, and Spinal Reflexes

The Brain and Cranial Nerves

Sensory Pathways and the Somatic Nervous System

The Autonomic Nervous System and Higher-Order Functions

The Special Senses

The Endocrine System

Blood

The Heart

Blood Vessels and Circulation

The Lymphatic System and Immunity

The Respiratory System

The Digestive System

Metabolism, Nutrition, and Energetics

The Urinary System

Fluid, Electrolyte, and Acid-Base Balance

The Reproductive System

Development and Inheritance

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