Question 1

What might a stronger clench reading suggest?

Accepted Answer

A) Decrease in motor recruitment 
B) Increase in motor recruitment 
C) Exhaustion of calcium ions 
D) Decreased frequency of nerve impulses delivered to the motor unit 
A) Decrease in motor recruitment 
B) Increase in motor recruitment 
C) Exhaustion of calcium ions 
D) Decreased frequency of nerve impulses delivered to the motor unit

Question 2

The neuromuscular junction is found between which two structures?

Accepted Answer

A) Axon terminal of motor axon and T-tubule 
B) Dendrite of motor neuron and sarcoplasm 
C) Axon terminal of motor neuron and motor end plate 
D) Cell body of motor neuron and myofibril 
A) Axon terminal of motor axon and T-tubule 
B) Dendrite of motor neuron and sarcoplasm 
C) Axon terminal of motor neuron and motor end plate 
D) Cell body of motor neuron and myofibril

Question 3

Which of the following statements describes the microscopic appearance of skeletal muscle tissue?

Accepted Answer

A) The cells are branched. 
B) The cells are long and striated. 
C) The cells have one to two nuclei. 
D) The cells are short and oblong shaped. 
A) The cells are branched. 
B) The cells are long and striated. 
C) The cells have one to two nuclei. 
D) The cells are short and oblong shaped.

Question 4

-Which lettered structure marks the axon terminal?

Accepted Answer

A) A 
B) B 
C) C 
D) D 
A) A 
B) B 
C) C 
D) D

Question 5

- The muscle fiber type marked with the number 2 uses ________ primarily to make ATP energy.

Accepted Answer

A) aerobic respiration 
B) anaerobic respiration 
C) fermentation 
A) aerobic respiration 
B) anaerobic respiration 
C) fermentation

Question 6

-Which lettered structure indicates the endomysium?

Accepted Answer

A) A 
B) B 
C) C 
D) D 
A) A 
B) B 
C) C 
D) D

Question 7

-Which labeled structure is the muscle fiber?

Accepted Answer

A) A 
B) B 
C) C 
D) D 
A) A 
B) B 
C) C 
D) D

Question 8

Which structure stores calcium?

Accepted Answer

A) Mitochondrion 
B) T-tubule 
C) Thin filament 
D) Sarcoplasmic reticulum 
A) Mitochondrion 
B) T-tubule 
C) Thin filament 
D) Sarcoplasmic reticulum

Question 9

Explain why an abundance of mitochondria in slow-oxidative fibers is correlated with an abundance of capillaries.

Accepted Answer

A) Increased delivery of oxygen is needed for sustained ATP production. 
B) They are both needed to produce the color of the slow-oxidative fibers. 
C) Myosin ATPase needs increased ATP production. 
D) Large diameter fibers enable more room for mitochondria, which in turn require more capillaries. 
A) Increased delivery of oxygen is needed for sustained ATP production. 
B) They are both needed to produce the color of the slow-oxidative fibers. 
C) Myosin ATPase needs increased ATP production. 
D) Large diameter fibers enable more room for mitochondria, which in turn require more capillaries.

Question 10

The endomysium of a muscle fiber is composed of loose connective tissue while the perimysium is composed of dense irregular connective tissue. What can you conclude about the function of the endomysium versus the function of the perimysium based on the tissue differences?

Accepted Answer

A) The endomysium only needs to electrically insulate the muscle fiber. 
B) The endomysium is under high levels of physical stress due to contraction of the muscle. 
C) The endomysium is effective at separating muscle fascicles. 
D) The endomysium only needs to form an electrical conduction pathway with the muscle fiber. 
A) The endomysium only needs to electrically insulate the muscle fiber. 
B) The endomysium is under high levels of physical stress due to contraction of the muscle. 
C) The endomysium is effective at separating muscle fascicles. 
D) The endomysium only needs to form an electrical conduction pathway with the muscle fiber.

Question 11

-Which muscle fiber type contains very few blood capillaries?

Accepted Answer

A) Slow oxidative (red) 
B) Fast oxidative (pink) 
C) Fast glycolytic (white) 
A) Slow oxidative (red) 
B) Fast oxidative (pink) 
C) Fast glycolytic (white)

Question 12

-Which labeled structure is the myofibril?

Accepted Answer

A) E 
B) F 
C) G 
D) D 
A) E 
B) F 
C) G 
D) D

Question 13

What is the region of the sarcolemma across from the axon terminal at the neuromuscular junction?

Accepted Answer

A) Motor end plate 
B) Triad 
C) Transverse tubule 
D) Fascicle 
A) Motor end plate 
B) Triad 
C) Transverse tubule 
D) Fascicle

Question 14

What will glycerin do to skeletal muscle fibers?

Accepted Answer

A) Adhere myosin heads to actin active sites 
B) Block actin active sites 
C) Remove ions and ATP so actin active sites are exposed 
D) Increases calcium permeability 
A) Adhere myosin heads to actin active sites 
B) Block actin active sites 
C) Remove ions and ATP so actin active sites are exposed 
D) Increases calcium permeability

Question 15

-Which lettered structure would secrete acetylcholine?

Accepted Answer

A) A 
B) B 
C) C 
D) D 
A) A 
B) B 
C) C 
D) D

Question 16

What does the perimysium surround?

Accepted Answer

A) Single muscle cell 
B) Single fascicle 
C) Single sarcomere 
D) Entire muscle 
A) Single muscle cell 
B) Single fascicle 
C) Single sarcomere 
D) Entire muscle

Question 17

-Which lettered structure indicates the organelle responsible for making ATP energy?

Accepted Answer

A) E 
B) F 
C) H 
D) I 
A) E 
B) F 
C) H 
D) I

Question 18

Which structures form the boundaries of the sarcomere?

Accepted Answer

A) Thin filaments 
B) Thick filaments 
C) Z-discs 
D) Triads 
A) Thin filaments 
B) Thick filaments 
C) Z-discs 
D) Triads

Question 19

Exposing skeletal muscle fibers to which substance disrupts the cells' troponin-tropomyosin complexes and prevents them from blocking the myosin binding sites on actin?

Accepted Answer

A) Glycerin 
B) Calcium 
C) Acetylcholine 
D) Sodium 
A) Glycerin 
B) Calcium 
C) Acetylcholine 
D) Sodium

Question 20

An electromyogram is a visual representation of ________.

Accepted Answer

A) action potentials generated along sarcolemmas 
B) transmission of acetylcholine 
C) activity of a single motor unit 
D) movement of charged ions out of the muscle cell 
A) action potentials generated along sarcolemmas 
B) transmission of acetylcholine 
C) activity of a single motor unit 
D) movement of charged ions out of the muscle cell

Exam 12: Introduction to the Muscular System: Muscle Tissue

What might a stronger clench reading suggest?

The neuromuscular junction is found between which two structures?

Which of the following statements describes the microscopic appearance of skeletal muscle tissue?

-Which lettered structure marks the axon terminal?

- The muscle fiber type marked with the number 2 uses ________ primarily to make ATP energy.

-Which lettered structure indicates the endomysium?

-Which labeled structure is the muscle fiber?

Which structure stores calcium?

Explain why an abundance of mitochondria in slow-oxidative fibers is correlated with an abundance of capillaries.

The endomysium of a muscle fiber is composed of loose connective tissue while the perimysium is composed of dense irregular connective tissue. What can you conclude about the function of the endomysium versus the function of the perimysium based on the tissue differences?

-Which muscle fiber type contains very few blood capillaries?

-Which labeled structure is the myofibril?

What is the region of the sarcolemma across from the axon terminal at the neuromuscular junction?

What will glycerin do to skeletal muscle fibers?

-Which lettered structure would secrete acetylcholine?

What does the perimysium surround?

-Which lettered structure indicates the organelle responsible for making ATP energy?

Which structures form the boundaries of the sarcomere?

Exposing skeletal muscle fibers to which substance disrupts the cells' troponin-tropomyosin complexes and prevents them from blocking the myosin binding sites on actin?

An electromyogram is a visual representation of ________.

Introduction to Anatomy and Physiology

Introduction to the Organ Systems

Chemistry

The Microscope

The Cell

Histology

The Integumentary System

Introduction to the Skeletal System

The Axial Skeleton

The Appendicular Skeleton

Joints

Gross Anatomy of the Muscular System

Introduction to the Nervous System

The Central Nervous System: Brain and Spinal Cord

The Peripheral Nervous System: Nerves and Autonomic Nervous System

General and Special Senses

The Endocrine System

Blood

Anatomy of the Heart

Physiology of the Heart

Anatomy of Blood Vessels

Circulatory Pathways and the Physiology of Blood Vessels

The Lymphatic System

Anatomy of the Respiratory System

Physiology of the Respiratory System

Anatomy of the Digestive System

Physiology of the Digestive System

Anatomy of the Urinary System

Physiology of the Urinary System

Reproductive and Development

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