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CH5 Muscular System REVIEW

Total questions: 47

Worksheet time: 45mins

Name
Class
Date
1.

Label the muscles

a)external oblique
b)rectus abdominis
c)internal oblique
d)external intercostal
e)internal intercostal
1
2
3
4
5
1)
2)
3)
4)
5)
2.

What is the main neurotransmitter at the neuromuscular junction?

a)

Dopamine

b)

Serotonin

c)

Acetylcholine

d)

Epinephrine

3.

The functional unit of a myofibril is called a:

a)

Myofilament

b)

Sarcolemma

c)

Sarcomere

d)

Myosin

4.

Which muscle tissue type is non-striated?

a)

Skeletal

b)

Smooth

c)

Cardiac

d)

Voluntary

5.

Ligaments connect:

a)

Muscle to bone

b)

Bone to bone

c)

Muscle to muscle

d)

Tendon to bone

6.

Which muscle is responsible for plantar flexion?

a)

Tibialis anterior

b)

Gastrocnemius

c)

Biceps femoris

d)

Quadriceps femoris

7.

The Achilles tendon connects the calf muscle to which bone?

a)

Talus

b)

Navicular

c)

Calcaneus

d)

Cuboid

8.

The SA node in the heart initiates contractions through which muscle type?

a)

Skeletal

b)

Cardiac

c)

Smooth

d)

Voluntary

9.

Which best describes involuntary motion?

a)

Requires conscious thought

b)

Controlled by the autonomic nervous system

c)

Controlled by the somatic nervous system

d)

Only occurs in skeletal muscle

10.

Why do skeletal muscles appear striated?

a)

Due to overlapping actin and myosin filaments

b)

Because of connective tissue wrappings

c)

Because they have a single nucleus

d)

Due to lack of mitochondria

11.

Which property allows muscles to respond to a stimulus?

a)

Elasticity

b)

Excitability

c)

Contractility

d)

Extensibility

12.

During contraction, the sarcomere:

a)

Lengthens

b)

Stays the same

c)

Shortens

d)

Disappears

13.

Which structure is responsible for connecting adjacent cardiac muscle cells?

a)

Desmosomes

b)

Intercalated discs

c)

Tendons

d)

Synaptic clefts

14.

Which of the following is a correct statement regarding the role of muscles in body temperature regulation?

a)

Muscles do not contribute to body heat

b)

Muscle activity increases heat production in the body

c)

Heat is only produced when muscles are inactive

d)

Only cardiac muscle produces heat

15.

What occurs when ACh remains in the synaptic cleft?

a)

The muscle remains contracted

b)

The muscle immediately relaxes

c)

Calcium channels close

d)

The neuron becomes hyperpolarized

16.

When you lift a textbook, which lever component is represented by your elbow joint?

a)

Force

b)

Resistance

c)

Fulcrum

d)

Insertion

17.

A torn hamstring that shows bruising and swelling but partial strength is a:

a)

Grade I

b)

Grade II

c)

Grade III

d)

Mild strain

18.

A severe muscle strain completely tearing the muscle results in:

a)

Tenderness only

b)

Mild swelling

c)

Complete loss of strength

d)

Increased elasticity

19.

Which feature is shared by both skeletal and cardiac muscle?

a)

Both are involuntary

b)

Both are multinucleate

c)

Both are striated

d)

Both are controlled by the SNS

20.

A loss of muscle tone would most directly affect:

a)

Heat production

b)

Posture maintenance

c)

Oxygen transport

d)

Neural transmission

21.

During muscular dystrophy, what protein is defective or missing?

a)

Actin

b)

Myosin

c)

Dystrophin

d)

Collagen

22.

A cyclist collapses after a 50 km ride due to electrolyte imbalance. What function is most affected?

a)

Muscle excitability

b)

Muscle elasticity

c)

Bone lever action

d)

Blood vessel dilation

23.

If a person’s ACh receptors are blocked, what would you expect?

a)

Continuous muscle contraction

b)

Paralysis

c)

Increased excitability

d)

Faster fatigue

24.

A marathoner develops atrophy in their legs after an injury. Which property is lost first?

a)

Contractility

b)

Elasticity

c)

Excitability

d)

Extensibility

25.

Which example shows extensibility in action?

a)

The bladder expanding to store urine

b)

The quadriceps contracting to extend the knee

c)

The hamstrings returning to resting position

d)

The biceps shortening to lift a dumbbell

26.

Which of the following best explains why Duchenne muscular dystrophy is more severe than Becker muscular dystrophy?

a)

Becker affects both skeletal and smooth muscle.

b)

Duchenne completely lacks functional dystrophin, while Becker retains partial function.

c)

Becker occurs only in females.

d)

Duchenne involves mitochondrial defects rather than gene mutations.

27.

A basketball player reports sharp pain and swelling after an abrupt sprint. The physician notes a partial tear with mild bruising and decreased strength. Which classification best fits this injury?

a)

Grade I – Mild strain

b)

Grade II – Moderate strain

c)

Grade III – Severe strain

d)

Chronic muscle fatigue

28.

Which of the following are characteristics of a Grade III muscle strain? (select all that apply)

a)

Complete loss of muscle function

b)

Mild pain and tenderness

c)

Muscle torn completely through

d)

Noticeable loss of strength

29.

Identify the muscles

a)trapezius
b)latissimus dorsi
c)deltoid
1
2
3
1)
2)
3)
30.

Identify the muscles

a)deltoid
b)pectoralis major
c)biceps brachii
d)brachialis
e)trapezius
f)sternocleidomastoid
1
2
3
4
5
6
1)
2)
3)
4)
5)
6)
31.

Identify the muscles and bones

a)clavicle
b)humerus
c)scapula
d)triceps brachii
e)latissimus dorsi
1
2
3
4
5
1)
2)
3)
4)
5)
32.

Identify the muscles

a)rectus femoris
b)vastus lateralis
c)vastus medialis
d)tibialis anterior
1
2
3
4
1)
2)
3)
4)
33.

Label the muscles

a)gluteus medius
b)gluteus maximus
c)semitendinosus
d)semimembranosus
e)biceps femoris
f)achilles tendon
1
2
3
4
5
6
1)
2)
3)
4)
5)
6)
34.

Identify the facial muscles:

a)frontalis
b)orbicularis oculi
c)zygomaticus
d)platysma
e)sternocleidomastoid
f)orbicularis oris
1
2
3
4
5
1)
2)
3)
4)
5)
35.

Label the components of the movement shown

a)agonist
b)antagonist
c)fixator
1
2
3
1)
2)
3)
36.

Label the components of the movement shown:

a)antagonist
b)agonist
c)fixator
1
2
3
1)
2)
3)
37.

Match the following histology "slides" with their label:

a)

1.

cardiac muscle

b)

2.

skeletal muscle

(longitudinal)

c)

3.

skeletal muscle

(transverse)

d)

4.

smooth muscle

38-41.

Using the bar graph to answer the questions:

38.

  1. Which sport involves the most muscle strains?

a)

Lacrosse

b)

Figure Skating

c)

Baseball

d)

Swimming

39.

  1. Which sport involves the most muscle contusions?

a)

Figure Skating

b)

Baseball

c)

Lacrosse

d)

Swimming

40.

  1. What percentage of swimming injuries is attributed to muscle strains?

a)

5%

b)

7%

c)

10%

d)

12%

41.

  1. What percentage of lacrosse injuries were due to muscle contusions?

a)

24%

b)

27%

c)

7%

d)

11%

42.

Identify the structures of the NMJ

a)synaptic vescicle
b)action potential
c)mitochondria
d)ACh
e)synaptic cleft
f)sarcolemma
g)ACh receptor
h)axon terminal
i)motor end plate
1
2
3
4
5
6
7
8
9
1)
2)
3)
4)
5)
6)
7)
8)
9)
43.

The neuromuscular junction is responsible for converting ​(1) (a)   impulses generated by the ​ (b)   into a ​(2) (c)   signal at the NMJ, back into the (1) impulse within the ​ (d)   , telling the muscle when to ​ (e)   .

Choose from the below words
electrical
chemical
contract
muscle fiber
motor neuron
relax
44.

Identify the origin and insertion of the muscle shown:

a)origin
b)insertion
1
2
1)
2)
45.

Identify the origin and insertion of the pictured muscle:

a)insertion
b)origin
1
2
1)
2)
46.

What is Label #7?

a)

blood vessel

b)

fascicle

c)

muscle fiber

d)

tendon

e)epimysium
f)endomysium
g)perimysium
1
2
3
4
5
6
7
1)
2)
3)
4)
5)
6)
7)
47.

During muscle contraction, ​ (1) (a)   attaches to receptors on the motor end plate, triggering a(n) ​ (2) (b)   in the ​ (c)   . This signal causes ​ (d)   to pull ​ (e)   inward, shortening the muscle fiber and producing contraction. When (1) is removed from the receptors, the (2) stops, and the muscle relaxes.

Choose from the below words
ACh
action potential
sarcolemma
myosin
actin
calcium
sodium
chemical impulse
dopamine
48.

Match the components of the musculoskeletal lever their definition:

a)

agonist

1.

muscle that contracts to create movement

b)

antagonist

2.

muscle that opposes the action of another

c)

synergist

3.

muscle assisting in the prime movement

d)

fixator

4.

muscle stabilizing the joint

49.
Question Image

Match the functions with a component of the muscular system:

a)

Applies the force for movement

1.

muscle

b)

Acts as the lever

2.

bone

c)

Acts as the fulcrum

3.

joint

d)

Connects bone to bone

4.

ligament

e)

Connects muscle to bone

5.

tendon

50.

During her pharmacy shift, Maria spends most of her 8-hour day standing at the prescription counter. By the end of her shift, she notices lower back discomfort and tingling in her legs. Her supervisor recommends adjusting her posture and alternating between standing and sitting breaks throughout the day.

Question:
Analyze how poor posture and decreased muscle tone could contribute to Maria’s symptoms, and evaluate how improving static and dynamic posture could enhance her musculoskeletal and circulatory function.

a)

Poor posture increases muscle tone, improving blood flow and preventing nerve compression.

b)

Poor posture decreases muscle tone, reducing blood flow and stressing nerves and ligaments; improving alignment restores circulation and support.

c)

Poor posture strengthens ligaments and increases muscle contraction, preventing fatigue and tension.

d)

Improved posture decreases muscle tone, allowing ligaments and tendons to relax completely and reduce tension.

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