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Muscle Tissue Quiz

Total questions: 100

Worksheet time: 58mins

Name
Class
Date
1.

What proportion of the body's mass is made up by muscle tissue?

a)

Nearly 1/4 of body's mass

b)

Nearly 1/2 of body's mass

c)

Nearly 3/4 of body's mass

d)

Nearly 1/3 of body's mass

2.

What type of energy conversion occurs in muscle tissue?

a)

Mechanical energy to chemical energy

b)

Chemical energy to electrical energy

c)

Chemical energy to mechanical energy

d)

Electrical energy to mechanical energy

3.

Which of the following will NOT be covered when looking at muscle tissue?

a)

Types

b)

Characteristics

c)

Functions

d)

Diseases

4.

Which prefixes are commonly used for muscle-related terminologies?

a)

Cardio, nephro, neuro

b)

Myo, mys, sarco

c)

Hepato, gastro, dermo

d)

Osteo, chondro, entero

5.

How many types of muscle tissue are there?

a)

Two

b)

Three

c)

Four

d)

Five

6.

Which types of muscle cells are elongated and referred to as muscle fibers?

a)

Skeletal and cardiac muscle cells

b)

Smooth and cardiac muscle cells

c)

Only skeletal muscle cells

d)

Skeletal and smooth muscle cells

7.

Where is skeletal muscle primarily located?

a)

In the walls of the heart

b)

Attached to bones or skin

c)

In walls of hollow visceral organs

d)

In the brain

8.

What is the characteristic cell shape and appearance of cardiac muscle?

a)

Single, very long, cylindrical, multinucleate cells with obvious striations

b)

Branching chains of cells; uni- or binucleate; striations

c)

Single, spindle shaped, uninucleate; no striations

d)

Multinucleate; no striations

9.

Which type of muscle is described as having single, spindle shaped, uninucleate cells with no striations?

a)

Skeletal

b)

Cardiac

c)

Smooth

d)

Epithelial

10.

What is a unique feature of skeletal muscle cells compared to cardiac and smooth muscle cells?

a)

They are branching chains of cells

b)

They are uninucleate

c)

They have no striations

d)

They are very long, cylindrical, and multinucleate with obvious striations

11.

Which of the following is NOT one of the four main characteristics of muscle tissue?

a)

Excitability

b)

Contractility

c)

Flexibility

d)

Extensibility

12.

What characteristic of muscle tissue allows it to return to its original shape after being stretched?

a)

Excitability

b)

Contractility

c)

Extensibility

d)

Elasticity

13.

Which characteristic of muscle tissue refers to its ability to be stretched or extended?

a)

Excitability

b)

Contractility

c)

Extensibility

d)

Elasticity

14.

What is the term used to describe the ability of muscle tissue to respond to stimuli?

a)

Excitability

b)

Contractility

c)

Extensibility

d)

Elasticity

15.

Which characteristic of muscle tissue enables it to actively generate force to produce movement?

a)

Excitability

b)

Contractility

c)

Extensibility

d)

Elasticity

16.

Which of the following is NOT one of the four important functions of muscles as listed in the learning material?

a)

Movement

b)

Maintain posture and body position

c)

Stabilize joints

d)

Produce oxygen

17.

What is one of the functions of muscles related to temperature regulation?

a)

Generate heat

b)

Absorb heat

c)

Conduct heat

d)

Reflect heat

18.

What does each muscle receive to control activity?

a)

A nerve, artery, and veins

b)

A nerve, artery, and capillaries

c)

A nerve, artery, and lymph vessels

d)

A nerve, artery, and bronchioles

19.

What do contracting muscle fibers require in large amounts?

a)

Proteins and vitamins

b)

Oxygen and nutrients

c)

Carbohydrates and fats

d)

Electrolytes and water

20.

Why do contracting muscle fibers need waste products removed quickly?

a)

To increase muscle size

b)

To prevent muscle fatigue

c)

To generate more heat

d)

To improve muscle flexibility

21.

What type of connective tissue surrounds entire muscles and may blend with fascia?

a)

Fine areolar connective tissue

b)

Dense irregular connective tissue

c)

Fibrous connective tissue

d)

Elastic connective tissue

22.

What type of connective tissue surrounds fascicles (groups of muscle fibers)?

a)

Dense irregular connective tissue

b)

Fibrous connective tissue

c)

Fine areolar connective tissue

d)

Elastic connective tissue

23.

What type of connective tissue surrounds each muscle fiber?

a)

Dense irregular connective tissue

b)

Fibrous connective tissue

c)

Fine areolar connective tissue

d)

Elastic connective tissue

24.

Which connective tissue sheath surrounds the entire muscle, providing an outer layer of protection?

a)

Perimysium

b)

Endomysium

c)

Epimysium

d)

Fascicle

25.

What is the name of the connective tissue that wraps around each individual muscle fiber?

a)

Perimysium

b)

Endomysium

c)

Epimysium

d)

Tendon

26.

What is the role of the perimysium?

a)

It wraps around each individual muscle fiber.

b)

It surrounds the entire muscle.

c)

It wraps around a bundle of muscle fibers known as a fascicle.

d)

It connects muscle to bone.

27.

What is a fascicle in the context of skeletal muscle?

a)

A type of connective tissue sheath

b)

A bundle of muscle fibers

c)

The outer layer of a muscle

d)

A type of bone

28.

Which of the following is not a prefix used to refer to muscle?

a)

Mys

b)

Myo

c)

Sarco

d)

Lemma

29.

How many places at least do muscles attach to bone?

a)

One

b)

Two

c)

Three

d)

Four

30.

What are the two points where muscles attach to bones called?

a)

Insertion and Extension

b)

Origin and Insertion

c)

Flexion and Extension

d)

Origin and Flexion

31.

What are the two types of muscle attachments?

a)

Direct and Indirect

b)

Flexible and Rigid

c)

Permanent and Temporary

d)

Strong and Weak

32.

What is another term for a direct muscle attachment?

a)

Bony

b)

Fleshy

c)

Tendinous

d)

Cartilaginous

33.

What is the connective tissue wrapping that covers a muscle externally?

a)

Endomysium

b)

Sarcolemma

c)

Perimysium

d)

Epimysium

34.

What is a fascicle in the context of skeletal muscle structure?

4 lines
35.

Which of the following best describes the appearance of a muscle fiber (cell)?

4 lines
36.

What surrounds a fascicle?

a)

Epimysium

b)

Sarcolemma

c)

Perimysium

d)

Endomysium

37.

What surrounds a muscle fiber (cell)?

a)

Epimysium

b)

Sarcolemma

c)

Perimysium

d)

Endomysium

38.

What are skeletal muscle fibers described as in terms of shape and nuclei?

a)

Short, branched cells with a single nucleus

b)

Long, cylindrical cells with multiple nuclei

c)

Spindle-shaped cells with two nuclei

d)

Flat, sheet-like cells with no nuclei

39.

Which of the following are considered modified organelles in muscle fiber microanatomy?

a)

Mitochondria, ribosomes, and endoplasmic reticulum

b)

Myofibrils, sarcoplasmic reticulum, and T tubules

c)

Golgi apparatus, lysosomes, and peroxisomes

d)

Nucleus, nucleolus, and vesicles

40.

What does the sarcoplasm of muscle fibers contain?

a)

Hemoglobin and lipids

b)

Glycogen and actin

c)

Glycosomes and myoglobin

d)

Myosin and enzymes

41.

Myofibrils are made up of densely packed, rodlike elements and account for what percentage of muscle cell volume?

a)

50%

b)

60%

c)

80%

d)

90%

42.

Which of the following is NOT a feature of myofibrils?

a)

Striations

b)

Sarcomeres

c)

Myofilaments

d)

Mitochondria

43.

A single muscle fiber can contain how many myofibrils?

a)

Hundreds

b)

Thousands

c)

Tens

d)

Millions

44.

What is the term for the plasma membrane of a muscle cell?

a)

Myofibril

b)

Sarcolemma

c)

Mitochondrion

d)

Nucleus

45.

What are the contractile elements of a muscle fiber called?

a)

Sarcolemma

b)

Mitochondrion

c)

Myofibril

d)

Nucleus

46.

Which organelle is known as the powerhouse of the cell and is also found in muscle fibers?

a)

Sarcolemma

b)

Myofibril

c)

Mitochondrion

d)

Nucleus

47.

What are the alternating dark and light bands seen in the myofibrils known as?

a)

Sarcolemma and Myofibril

b)

Mitochondrion and Nucleus

c)

Dark A band and Light I band

d)

Nucleus and Sarcolemma

48.

What are striations in myofibrils?

a)

A single dark band

b)

Stripes formed from repeating series of dark and light bands along the length of each myofibril

c)

A type of muscle cell

d)

The light region in the middle of the A band

49.

What is the H zone in the context of myofibrils?

a)

The line of protein that bisects the H zone vertically

b)

The darker region of the A band

c)

The lighter region in the middle of the A band

d)

The coin-shaped sheet of proteins on the midline of the light I band

50.

What does the M line represent in the structure of a myofibril?

a)

The lighter region in the middle of the A band

b)

The darker region of the A band

c)

The line of protein (myomesin) that bisects the H zone vertically

d)

The coin-shaped sheet of proteins on the midline of the light I band

51.

What is the Z disc (line) in the structure of a myofibril?

a)

The darker region of the A band

b)

The lighter region in the middle of the A band

c)

The line of protein that bisects the H zone vertically

d)

The coin-shaped sheet of proteins on the midline of the light I band

52.

What is the magnification used in the photomicrograph of the muscle fibers shown in Figure 9.2a?

a)

100X

b)

500X

c)

700X

d)

1000X

53.

What distinctive pattern is noticeable in the muscle fibers shown in Figure 9.2a?

a)

Cross-hatching

b)

Striations

c)

Smooth texture

d)

Polka dots

54.

What are myofilaments composed of?

a)

Only actin

b)

Only myosin

c)

Actin and myosin

d)

Actin and collagen

55.

Actin myofilaments are also known as what?

a)

Thick filaments

b)

Z discs

c)

Thin filaments

d)

M line

56.

Where are actin myofilaments anchored?

a)

M line

b)

H zone

c)

Z discs

d)

A band

57.

Myosin myofilaments are referred to as what type of filament?

a)

Thin filament

b)

Z filament

c)

Thick filament

d)

I filament

58.

What defines the region of a sarcomere?

a)

The area between two M lines

b)

The length of the A band

c)

The region between two successive Z discs

d)

The width of the I band

59.

How far do actin myofilaments extend within the sarcomere?

a)

Across the I band and part way in the H zone

b)

Across the I band and part way in the A band

c)

Across the A band and part way in the I band

d)

Across the H zone and part way in the M line

60.

Where do myosin myofilaments extend to within the sarcomere?

a)

The length of the I band

b)

The length of the A band

c)

The length of the H zone

d)

The length of the Z disc

61.

What is the name of the region in a skeletal muscle fiber where only thin filaments are found?

a)

A band

b)

H zone

c)

I band

d)

M line

62.

Which of the following best describes the H zone in the context of skeletal muscle fibers?

a)

A) It contains both thick and thin filaments.

b)

B) It is the region where only thin filaments are found.

c)

C) It is the region where only thick filaments are found.

d)

D) It is the line that runs down the center of the sarcomere.

63.

What are the thick filaments in the skeletal muscle fiber primarily composed of?

a)

Actin

b)

Myosin

c)

Titin

d)

Tropomyosin

64.

What is the function of the Z disc in skeletal muscle fibers?

a)

A) It anchors the thick filaments.

b)

B) It anchors the thin filaments.

c)

C) It separates the sarcomeres from each other.

d)

D) It is the central region of the thick filaments.

65.

Where do thick and thin filaments overlap in a skeletal muscle fiber?

a)

I band

b)

H zone

c)

M line

d)

Outer edge of A band

66.

What does the label 'a' refer to in the microscopic anatomy of a skeletal muscle fiber?

a)

Sarcomere

b)

Mitochondrion

c)

Myofibril

d)

Sarcoplasmic reticulum

67.

Which label corresponds to the mitochondrion in the skeletal muscle fiber diagram?

a)

b

b)

e

c)

f

d)

h

68.

Identify the structure labeled 'i' in the diagram of the microscopic anatomy of a skeletal muscle fiber.

a)

Myofibril

b)

T-tubule

c)

Sarcolemma

d)

Cross-section of myofibrils at Z disc

69.

What does the label 'f' indicate in the diagram of the microscopic anatomy of a skeletal muscle fiber?

a)

Sarcoplasmic reticulum

b)

Myofibril

c)

T-tubule

d)

Sarcolemma

70.

Which label in the skeletal muscle fiber diagram represents the sarcolemma?

a)

c

b)

d

c)

g

d)

h

71.

De qué está compuesta la molécula de miosina en los filamentos gruesos?

a)

Dos cadenas pesadas de polipéptidos y dos cadenas ligeras

b)

Dos cadenas pesadas de polipéptidos y cuatro cadenas ligeras

c)

Cuatro cadenas pesadas de polipéptidos y dos cadenas ligeras

d)

Cuatro cadenas pesadas de polipéptidos y cuatro cadenas ligeras

72.

¿Qué forman las cadenas pesadas de la miosina?

a)

Forman la cabeza globular de la miosina

b)

Forman puentes cruzados con los filamentos delgados

c)

Se entrelazan para formar la cola de la miosina

d)

Se unen a los sitios de unión de actina

73.

¿Qué función tienen las cabezas de la miosina durante la contracción muscular?

a)

Se unen a los sitios de unión de ATP

b)

Se entrelazan para formar la cola de la miosina

c)

Enlazan los filamentos gruesos y delgados formando puentes cruzados

d)

Se desplazan de forma aleatoria sin interactuar con otros filamentos

74.

¿Cómo están dispuestas las miosinas en relación con los filamentos gruesos?

a)

Las miosinas están alineadas uniformemente a lo largo del filamento grueso

b)

Las miosinas están dispuestas al azar alrededor del filamento grueso

c)

Las miosinas están desplazadas entre sí, formando una matriz escalonada

d)

Todas las miosinas están orientadas en la misma dirección

75.

What is the composition of a thick filament in muscle cells?

a)

Actin molecules only

b)

Myosin molecules only

c)

Both actin and myosin molecules

d)

Troponin and tropomyosin molecules

76.

Where do the heads of myosin molecules protrude in a thick filament?

a)

At the center of the filament

b)

At random points along the filament

c)

At opposite ends of the filament

d)

Only at one end of the filament

77.

What is the function of the ATP-binding site found on the myosin heads?

a)

It binds to actin filaments

b)

It provides structural support to the myosin heads

c)

It is the site where ATP is hydrolyzed to provide energy for muscle contraction

d)

It prevents the myosin heads from attaching to the actin filaments

78.

What is actin composed of?

a)

F actin subunits

b)

G actin subunits

c)

Tropomyosin subunits

d)

Troponin subunits

79.

What do G actin subunits link together to form?

a)

Tropomyosin

b)

Troponin

c)

F actin

d)

Myosin

80.

What is the role of tropomyosin and troponin in myofibrils?

4 lines
81.

How do two F actin strands interact to form a structure?

a)

They bind to myosin to form a thick filament.

b)

They twist together to form a thin filament.

c)

They wrap around tropomyosin to form a coil.

d)

They align in parallel to form a sheet.

82.

What does a thin filament consist of?

a)

Two strands of myosin subunits twisted into a helix

b)

Two strands of actin subunits twisted into a helix plus two types of regulatory proteins (troponin and tropomyosin)

c)

Two strands of collagen fibers plus two types of regulatory proteins

d)

Two strands of actin subunits twisted into a double helix without any regulatory proteins

83.

Which regulatory proteins are associated with the thin filaments?

a)

Myosin and collagen

b)

Actin and myosin

c)

Troponin and tropomyosin

d)

Keratin and elastin

84.

Where are the myosin-binding sites located in the muscle filament structure?

a)

On the tropomyosin

b)

On the troponin

c)

On the actin subunits

d)

On the myosin subunits

85.

What is the composition of the elastic filament in myofibrils?

a)

Myomesin

b)

Dystrophin

c)

Nebulin

d)

Titin

86.

What is the role of dystrophin in myofibrils?

a)

It helps recoil after stretch

b)

It resists excessive stretching

c)

It links thin filaments to proteins of sarcolemma

d)

It aligns the thin filaments

87.

Which protein is described as an inelastic protein that helps align the thin filaments?

a)

Dystrophin

b)

Titin

c)

Nebulin

d)

Myomesin

88.

What is the most common and serious form of muscular dystrophies that generally appears during childhood?

a)

Becker muscular dystrophy

b)

Myotonic dystrophy

c)

Duchenne muscular dystrophy (DMD)

d)

Limb-girdle muscular dystrophy

89.

At what age does Duchenne muscular dystrophy (DMD) typically appear?

a)

Between 2 and 7 years

b)

At birth

c)

Between 10 and 15 years

d)

During adolescence

90.

How does Duchenne muscular dystrophy (DMD) progress?

a)

From the head downward

b)

From the extremities upward

c)

From the torso outward

d)

Randomly throughout the body

91.

What is the life expectancy of individuals with Duchenne muscular dystrophy (DMD) with supportive care?

a)

20s

b)

30s

c)

40s

d)

50s

92.

What is the cause of Duchenne muscular dystrophy (DMD)?

a)

Defective gene for myosin

b)

Defective gene for actin

c)

Defective gene for dystrophin

d)

Defective gene for collagen

93.

What happens to the sarcolemma of DMD patients?

a)

It becomes more rigid and resistant to damage

b)

It tears easily, allowing entry of excess calcium

c)

It thickens and prevents muscle contraction

d)

It loses its ability to conduct electrical impulses

94.

What is a consequence of the sarcolemma damage in DMD patients?

a)

Increased production of muscle cells

b)

Decreased apoptosis of muscle cells

c)

Increased apoptosis of muscle cells and drop in muscle mass

d)

Improved regenerative capacity of muscle cells

95.

Which of the following muscular functions serves a metabolic function?

a)

Movement

b)

Posture maintenance

c)

Joint stabilization

d)

Heat generation

96.

Of the following muscle types, which is the only one subject to conscious control?

a)

Smooth

b)

Skeletal

c)

Cardiac

d)

All of these muscle types are subject to conscious control.

97.

What is the sarcoplasmic reticulum primarily composed of?

a)

A network of rough endoplasmic reticulum tubules

b)

A network of smooth endoplasmic reticulum tubules

c)

A single layer of phospholipids

d)

A series of interconnected mitochondria

98.

What is the function of the sarcoplasmic reticulum in muscle cells?

a)

Synthesis of proteins

b)

Regulation of intracellular Na+ levels

c)

Regulation of intracellular Ca2+ levels

d)

Breakdown of glucose

99.

How are the terminal cisterns of the sarcoplasmic reticulum arranged in relation to the myofibril?

a)

Parallel to the myofibril

b)

Perpendicular to the myofibril at the A-I band junction

c)

Randomly around the myofibril

d)

In a concentric pattern around the myofibril

100.

What does the sarcoplasmic reticulum store and release?

a)

ATP

b)

Na+

c)

Ca2+

d)

Glucose

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