Deck 10: Muscle Tissue

Question 1

The mitochondria in skeletal muscle fiber are arranged

A)randomly throughout the sarcoplasm.
B)in circles around the T-tubules.
C)around the nuclei.
D)in rows near the contractile muscle proteins.
E)close to the sarcolemma.

Answer 1

D

Question 2

Compare and contrast the structural characteristics of the three different types of muscular tissue.

Answer 2

No Answer

Question 3

The sarcoplasmic reticulum in skeletal muscle fibers is used for storing

A)oxygen.
B)ATP.
C)PO43-.
D)Na+.
E)Ca2+.

Answer 3

E

Question 4

Myofibrils contain

A)contractile proteins.
B)regulatory proteins.
C)structural proteins.
D)all of these answers are correct.
E)none of these answers are correct.

Question 5

How many arteries and veins usually accompany a single nerve penetrating a skeletal muscle?

A)one artery and one or two veins
B)two arteries and two veins
C)three arteries and two veins
D)one artery and three veins
E)one artery and a varied amount of veins

Question 6

This is the outermost layer of connective tissue surrounding a skeletal muscle.

A)tendon
B)ligament
C)endomysium
D)epimysium
E)perimysium

Question 7

The type of tendon formed when the connective tissue elements of a skeletal muscle extend as a broad flat layer.

A)perimysium
B)deep fascia
C)fascicle
D)aponeurosis
E)endomysium

Question 8

Which of the following correctly lists the sequence of structures that action potentials must move through to excite skeletal muscle contraction?

A)sarcolemma,axon of neuron,T tubules
B)T tubules,sarcolemma,myofilament
C)muscle fiber,axon of neuron,myofibrils
D)axon of neuron,sarcolemma,T tubules
E)myofibrils,myofilaments,mitochondria

Question 9

Release of calcium from these structures triggers skeletal muscle contraction.

A)myofibrils
B)mitochondria
C)terminal cisterns of sarcoplasmic reticulum
D)T-tubules
E)none of the answer choices

Question 10

This is the property of muscle that gives it the ability to stretch without damage.

A)electrical excitability
B)contractility
C)extensibility
D)elasticity
E)thermogenesis

Question 11

How much of the total body weight of an average adult is muscle tissue?

A)20-30%
B)30-40%
C)40-50%
D)50-60%
E)60-70%

Question 12

In neuromuscular junctions,synaptic vesicles containing acetylcholine are found suspended in the cytosol of

A)myelin bulbs.
B)neuromuscular bulbs.
C)synaptic end bulbs.
D)axon collateral bulbs.
E)tubule bulbs.

Question 13

The contractile organelles of a skeletal muscle fiber are thread-like structures called

A)myofibrils.
B)myoglobin.
C)mitochondria.
D)Z discs.
E)M lines.

Question 14

Which of the following regions of the sarcomere contain thick filaments?

A)zone of overlap
B)A band
C)H zone
D)both A band and H zone
E)All of these answer choices are correct.

Question 15

Which of the following functions as a motor protein in all three types of muscle tissue?

A)actin
B)myosin
C)troponin
D)titin
E)tropomyosin

Question 16

In an isometric contraction the muscle develops tension but does not

A)lengthen.
B)widen.
C)does not expend energy.
D)conduct electrical current.
E)exhibit elasticity.

Question 17

Which of the following is NOT a major function of muscle tissue?

A)moving blood throughout the body
B)generating heat through contractions
C)stabilizing the movement of joints
D)promoting movement of body structures
E)Production of Vitamins.

Question 18

After the fusion of myoblasts,the muscle fiber loses its ability to do what?

A)grow
B)lengthen
C)contract
D)go through cell division.
E)all of the answer choices

Question 19

Which of the following regions of a sarcomere contain thin filaments?

A)I band
B)A band
C)H zone
D)Both I band and A band.
E)All of these answer choices are correct.

Question 20

The different types of muscle tissue differ from each other by

A)microscopic anatomy.
B)location.
C)type of Control.
D)both microscopic anatomy and location.
E)All of these choices are correct.

Question 21

A brief contraction of all muscle fibers in a motor unit in response to a single action potential moving down the somatic motor neuron is known as

A)isometric contraction.
B)isotonic contraction.
C)tetany.
D)refractory period.
E)twitch contraction.

Question 22

To stimulate skeletal muscle contraction,acetylcholine must cross the __________ of the neuromuscular junction and bind to receptors on the motor endplate.

A)node of Ranvier
B)synaptic cleft
C)sarcolemma
D)synaptic end bulb
E)transverse tubule

Question 23

What energizes the myosin head?

A)the actin filaments
B)calcium ions
C)potassium ions
D)ATP hydrolysis reaction
E)ADP synthesis

Question 24

Which of the following microscopic structures is only found in the cardiac muscle tissue?

A)myosin
B)tropomyosin
C)sarcomeres
D)intercalated discs
E)striations

Question 25

Smooth muscle tone is maintained by the prolonged presence of ______ in the muscle cell's cytosol?

A)ATP
B)calcium ions
C)phosphate ions
D)myoglobin
E)None of these choices.

Question 26

Describe the factors that lead to muscle fatigue.

Question 27

Which of the following are commonly used to produce ATP during skeletal muscle contraction?

A)creatine phosphate
B)anaerobic cellular respiration
C)aerobic cellular respiration
D)All of these choices are correct.
E)None of these choices are correct.

Question 28

This is also referred to as the period of lost excitability in skeletal muscle fibers.

A)refractory period
B)contraction period
C)latent period
D)relaxation period
E)wave summation

Question 29

A period of sustained skeletal muscle contraction in which individual twitches cannot be detected is called

A)unfused tetanus.
B)muscle atrophy.
C)flaccidity.
D)fused tetanus.
E)wave summation.

Question 30

What regulatory proteins can be found in the thin filaments of skeletal muscle fibers?

A)troponin and titin
B)tropomyosin and troponin
C)myosin and titin
D)titin and tropomyosin
E)tropomyosin and myosin

Question 31

This consists of a somatic motor neuron and all the skeletal muscle fibers it stimulates.

A)sarcomere
B)motor unit
C)neuromuscular junction
D)muscle unit
E)multi-unit smooth muscle

Question 32

Which of the regions of a sarcomere contain titin?

A)the A band only
B)the H zone only
C)the zone of overlap only
D)from M line to Z disc
E)the I band only

Question 33

In skeletal muscles,the combined amounts of creatine phosphate and ATP provide enough energy for the muscle to contract maximally for approximately

A)15 seconds.
B)15 minutes.
C)1.5 minutes.
D)5 seconds.
E)one minute.

Question 34

Which of the following proteins is used to reinforce the sarcolemma and to help transmit the tension generated by the sarcomeres to the tendons?

A)troponin
B)tropomyosin
C)myosin
D)actin
E)dystrophin

Question 35

Increasing the number of active motor units within a skeletal muscle is called

A)wave summation.
B)fused tetanus.
C)motor unit recruitment.
D)muscle tone.
E)flaccidity.

Question 36

Which of the following types of muscle tissue contract when excited by their own autorhythmic muscle fibers?

A)cardiac muscle
B)slow twitch oxidative skeletal muscle
C)multi-unit smooth muscle
D)fast twitch glycolytic skeletal muscle
E)All of these choices are correct.

Question 37

Calcium ions are released from the sarcoplasmic reticulum into the cytosol

A)at the beginning of a contraction.
B)in response to acetylcholine binding to Ca2+ release channels.
C)by active transport using Ca2+ pumps in the SR membrane.
D)after the contraction ends.
E)All of these answers are correct.

Question 38

Skeletal muscle contraction will continue to occur as long as the following chemicals are available in the cytosol of the muscle fiber.

A)ATP and acetylcholine (ACh)
B)calcium ions and ATP
C)ACh and potassium ions
D)sodium ions and ATP
E)calcium and ACh

Question 39

During muscle contraction by the sliding filament mechanism,thin filaments are pulled towards the

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

Question 40

This is the least powerful type of skeletal muscle fiber.

A)slow oxidative fiber
B)fast oxidative fiber
C)fast glycolytic fiber
D)slow glycolytic fiber
E)None of these choices.

Question 41

In the diagram,one of the components of a myofibril is the structure labeled ________.?

A)G
B)H
C)B
D)J
E)None of these choices are correct.

Question 42

In the diagram,what is the basic functional unit of a myofibril?

A)B
B)C
C)F
D)Both B and C
E)All of these choices are correct.

Question 43

In the diagram,what structure is filled with mostly interstitial fluid?

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

Question 44

Hyperplasia is

A)an increase in the size of muscle fibers.
B)a decrease in the size of muscle fibers.
C)an increase in the number of muscle fibers.
D)a decrease in the number of muscle fibers.
E)none of these choices.

Question 45

In the diagram,which labeled structure contains regulatory proteins that respond to rising Ca2+ concentrations in the cytoplasm of the skeletal muscle cell?

A)B
B)C
C)E
D)All of these choices are correct.
E)None of these choices are correct.

Question 46

In the diagram,where are the mitochondria located?

A)A
B)B
C)D
D)C
E)K

Question 47

In the diagram,a tendon is formed by the merging of the following structures

A)C,D,and H
B)D and E
C)H and C
D)C and D
E)All of these choices are correct.

Question 48

On the diagram,where is the outer most layer of connective tissue encircling the entire muscle

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

Question 49

In the diagram,which structure helps return a stretched sarcomere to its resting length?

A)B
B)C
C)E
D)Both B and C
E)All of these choices are correct.

Question 50

In the diagram,which labeled structure contains motor proteins that convert the energy in ATP into mechanical movements?

A)C
B)A
C)E
D)D
E)None of these are correct.

Question 51

Which of the labeled structures on the diagram holds muscles with similar functions together,allows free movement of muscles,carries nerves,blood vessels and lymphatic vessels,and fills spaces between muscles?

A)A
B)B
C)E
D)G
E)H

Question 52

In the diagram,a bundle of muscle fibers form which structure?

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

Question 53

Which of the following structures are made of dense regular connective tissue?

A)F
B)A
C)I
D)Both F and I
E)All of these choices.

Question 54

In the diagram,where is the axon collateral?

A)B
B)C
C)D
D)E
E)None of these choices

Question 55

In the diagram,individual muscle fibers are covered by this layer.

A)K
B)I
C)L
D)M
E)A

Question 56

In the diagram,where is the axon terminal?

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

Question 57

In the diagram,where would you find the largest amount of glycogen?

A)A
B)D
C)F
D)K
E)B

Question 58

In the diagram,which of the labeled structures is an integral component of a neuromuscular junction?

A)A
B)B
C)C
D)D
E)E
F)None of these choices

Question 59

In the diagram,the neurotransmitter,acetylcholine,is released from this area.

A)B
B)C
C)D
D)G
E)H

Question 60

In the diagram,where would you find stored Ca2+?

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

Question 61

In embryonic muscle development,what happens to the somites?

Question 62

List the four steps of the contraction cycle in order of occurrence.What is needed for these steps to continuously repeat?

Question 63

In the diagram,where is the H zone?

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

Question 64

What is the major difference between the two types of smooth muscle tissue?

Question 65

In the diagram,where is the M line?

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

Question 66

In the diagram,locate the region where only myosin proteins are found.

A)A
B)B
C)D
D)E
E)None of these is correct.

Question 67

Which of the following is NOT seen in exercise-induced muscle damage?

A)torn sarcolemmas
B)damaged myofibrils
C)sore muscles
D)progressive degeneration of muscles
E)disrupted Z-discs

Question 68

In the diagram,where is the A band?

A)G
B)H
C)I
D)J
E)None of these are correct.

Question 69

In the diagram,the thin filaments are found in the region labeled ______.

A)C
B)E
C)B
D)Both C and E
E)All of these choices

Question 70

What are the three ways that ATP can be produced in muscle fibers?

Question 71

In the diagram,where is the zone of overlap?

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

Question 72

Which event does not occur during the onset of rigor mortis?

A)Enzymes from lysosomes digest crossbridges.
B)Cellular membranes become leaky.
C)Myosin heads bind to actin.
D)Calcium ions leak out of the sarcoplasmic reticulum.
E)ATP synthesis ceases.

Question 73

In the diagram,which structure(s)moves towards the center of the sarcomere (closer together)when the fiber contracts?

A)A
B)D
C)J
D)Both A and D.
E)None of these are correct.

Question 74

Which is a correct sequence of events in the onset of rigor mortis?

A)Cellular membranes become leaky -> myosin heads bind to actin -> calcium ions leak into the sarcoplasm -> muscles are in a state of rigidity.
B)Cellular membranes become leaky -> calcium ions leak into the sarcoplasm -> myosin heads bind to actin -> muscles are in a state of rigidity.
C)Myosin heads bind to actin -> cellular membranes become leaky -> calcium ions leak into the sarcoplasm -> muscles are in a state of rigidity.
D)Calcium ions leak into the sarcoplasm -> cellular membranes become leaky -> myosin heads bind to actin -> muscles are in a state of rigidity.
E)Calcium ions leak into the sarcoplasm -> myosin heads bind to actin -> muscles are in a state of rigidity -> cellular membranes become leaky.

Question 75

Which of the following best describes the condition known as muscular hypertrophy?

A)decrease in diameter of muscle fibers
B)torn sarcolemmas and damaged myofibrils
C)increase in diameter of muscle fibers
D)actin and myosin remain attached by crossbridges and the muscle is rigid
E)damaged neuromuscular junctions

Question 76

An EMG can be used to determine each of the following except

A)the source of muscle weakness.
B)paralysis due to muscle malfunction.
C)paralysis due to nerve supplying the muscle.
E)diagnose certain muscle disorders like muscular dystrophy.
F)find the precise location of a muscle tumor.

Question 77

In the diagram,where are thick filaments found?

A)C
B)E
C)A
D)B
E)All of these choices

Question 78

How does a nerve impulse elicit a muscle action potential?

Question 79

Which of the following disorders is characterized by the wasting away of muscles due to the progressive loss of myofibrils?

A)muscular hypertrophy
B)muscular atrophy
C)fibromyalgia
D)myasthenia gravis
E)tremors

Question 80

In the diagram,where is the I band?

A)G
B)H
C)I
D)J
E)D