Solved by a verified expert:1 of 25
Which of the following is a correctly describes muscle
tissue?
a Skeletal
muscle is multinucleated, striated, and involuntary.
b Smooth
muscle is uninucleated, striated, and involuntary.
c Cardiac
muscle is uninucleated, striated, and involuntary.
d Skeletal
muscle is uninucleated, nonstriated, and voluntary.
e Smooth
muscle is multinucleated, nonstriated, and voluntary.
2 of 25
What overlapping structures cause the “banding”
appearance of skeletal muscle fibers?
a Myofibrils
actin and myosin
b Myofilaments
actin and myosin
c T
tubules
d Sarcolemmas
e Acetylcholine
3 of 25
Which of the following describes actin containing filaments?
a They
slide towards each other during contraction.
b They make
up the large thick filament.
c They
shorten during contraction.
d They
contain projections called cross bridges.
e They are
the only filament in the A band.
4 of 25
What does it mean when the sarcolemma is depolarized?
a A
reverse of the electrical conditions of the membrane due to an influx of
potassium
b A reverse
of the electrical conditions of the membrane due to an influx of acetylcholine
c A
reverse of the electrical conditions of the membrane due to an influx of sodium
ions
d A
stabilization of the electrical conditions of the membrane due to an influx of
calcium ions
e A
stabilization of the electrical conditions of the membrane due to a loss of
sodium
5 of 25
What is the role of acetylcholine in muscle contraction?
a Acetylcholine
attaches to the sarcolemma and makes the membrane more permeable.
b Acetylcholine
attaches to the myosin and makes the myofilaments attach.
c Acetylcholine
travels deep into the tubules and causes calcium to be released from the sarcoplasmic
reticulum.
d Acetylcholine
initiates the energy needed for the sliding filaments to move.
e Acetylcholine
triggers the release of calcium into the synaptic gap.
6 of 25
What chemical triggers the sliding of the muscle filaments?
a Sodium
b ATP
c Potassium
d Acetylcholine
e Calcium
7 of 25
Which of the following describes complete tetanus of a
muscle?
a A single
stimulus is delivered, and the muscle contacts and relaxes.
b Stimuli
are delivered frequently, and the contraction force increases with little
relaxation.
c A smooth
continuous contraction without any evidence of relaxation because stimulus is
delivered rapidly and continually.
d A weak
stimulus is delivered, and the muscle does not contract.
e A strong
stimulus is delivered, but the muscle is fatigued and will not contract.
8 of 25
What is the slowest pathway for ATP regeneration?
a Direct
phosphorylation
b Aerobic
respiration
c Lactic
acid production
d Glycolysis
e Anaerobic
respiration
9 of 25
Which of the following describes isometric muscle exercise?
a Muscle
size and strength will increase because the muscle fibers are making more
myofilaments.
b Muscle
endurance increases because the circulation to the muscles is enhanced.
c Muscle size
increases because the muscle fibers produce more mitochondria.
d Muscle
flexibility is increased because the muscle continually shortens.
e Muscles
do not shorten during contraction so the muscles do not increase in size.
10 of 25
Which of the following correctly describes one of the five
golden rules of skeletal muscle activity?
a The bulk
of the muscle usually lies distal to the joint crossed.
b Most
skeletal muscles cross at least one joint.
c Skeletal
muscles can only push, not pull.
d During contraction,
a skeletal muscle origin moves toward the insertion.
e Skeletal
muscles have no more than one attachment point.
11
When a person shakes the head to indicate “no,”
what type of movement is being demonstrated?
a Flexion
b Opposition
c Rotation
d Adduction
e Circumduction
12
What type of movement is indicated when a limb is moved
toward the midline of the body?
a Flexion
b Opposition
c Abduction
d Adduction
e Circumduction
13
Which of the following describes muscle insertion?
a It is
usually proximal to the origin.
b It does
not move when the muscle contracts.
c It does
not attach to a bone or skin.
d It moves
away from the origin when a muscle contracts.
e It moves
toward the origin when a muscle contracts.
14
When the knee is bent, the hamstring group of muscles
contract. What is the insertion of this muscle group?
a Femur
b Ischium
c Tibia
d Tarsals
e Sacrum
15
What is the significant role of synergists and fixators?
a They are
responsible for the primary movement desired.
b They are
responsible for reversing the movement desired.
c They are
antagonists of each other.
d They
stabilize a bone and prevent excessive unwanted movement.
e They are
responsible for the stretch of a primary mover.
16
What criterion is used in naming the deltoid muscle?
a Muscle
shape
b Muscle
location
c Action
of the muscle
d Number of
origins
e Direction
of the muscle fibers
17
What is the fascicle arrangement of the orbicularis oris
muscle?
a Pennate
b Parallel
c Fusiform
d Convergent
e Circular
18
What muscle compresses the cheek to hold food between the
teeth during chewing?
a Masseter
b Temporalis
c Buccinator
d Platysma
e Zygomatic
19 of 25
What muscle is responsible for the flexion of the head?
a Platysma
b Sternocleidomastoid
c Masseter
d Temporalis
e Trapezius
20
What muscle is a prime mover of arm abduction and also a
favored site for administering intramuscular injections?
a Triceps
brachii
b Biceps
brachii
c Deltoid
d Gluteus
medius
e Gluteus
maximus
21
What is the function of the latissimus dorsi muscle?
a Depression
and adduction of the scapula
b Extension
and adduction of the humerus
c Extension
of the neck
d Extension
of the back
e Lateral
flexion of the spine
22
Which muscle is responsible for knee flexion?
a Gluteus
medius
b Gluteus
maximus
c Tibialis
anterior
d Soleus
e Biceps
femoris
23
What muscle is the prime mover for plantar flexion?
a Gastrocnemius
b Sartorius
c Rectus
femoris
d Tibialis
anterior
e Biceps
femoris
24
Which of the following describes muscle fatigue?
a The
muscle loses tone and becomes flaccid.
b The
muscle is unable to contract due to oxygen deficiency.
c The
muscle has atrophied as a result of not being used.
d The
muscle is contracting but not shortening.
e The
muscle has become paralyzed due to nerve damage.
25
Which of the following describes muscular dystrophy?
a Muscle
weakness due to an autoimmune disease
b Muscle
weakness due to disuse and lack of calcium blood levels
c Muscle
weakness due to atrophy and increased fat and connective tissue deposits
d Uncontrolled
muscle activity due to abnormal neural conduction
e Uncontrolled
muscle activity due to increased calcium blood levels
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