Deck 9: Muscular System

Question 1

Which of the following muscles is described as striated and involuntary?

A) aponeurosis
B) smooth
C) skeletal
D) cardiac

Answer 1

cardiac

Question 2

The brachialis and brachioradialis

A) flex the arm at the elbow.
B) extend the hand.
C) are antagonistic to the biceps brachii.
D) shrug the shoulders.

Answer 2

flex the arm at the elbow.

Question 3

This large muscle extends the thigh at the hip.

A) sartorius
B) hamstring
C) rotator cuff
D) latissimus dorsi

Answer 3

hamstring

Question 4

The biceps femoris,semitendinosus,and semimembranosus

A) flex the foot.
B) attach to the patella.
C) are the hamstrings.
D) are located on the anterior thigh.

Question 5

Which muscles are located between the ribs and help move the rib cage during breathing?

A) diaphragm
B) sternocleidomastoid
C) serratus anterior
D) intercostal muscles

Question 6

The quadriceps femoris group and the hamstrings

A) lie along the anterior part of the leg.
B) flex the foot.
C) lie along the thigh.
D) shrug the shoulders.

Question 7

This muscle attaches to the cranial aponeurosis and wrinkles the forehead.

A) frontalis
B) buccinator
C) orbicularis oculi
D) platysma

Question 8

This flat muscle covers the forehead and raises the eyebrows (for a "surprised" look).

A) frontalis
B) zygomaticus
C) masseter
D) buccinator

Question 9

"Pumping iron" is most likely to cause

A) atrophy.
B) contracture formation.
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C) hypertrophy.
D) muscular dystrophy.

Question 10

This muscle is located on the posterior area of the body.

A) latissimus dorsi
B) pectoralis major
C) quadriceps femoris
D) sternocleidomastoid

Question 11

The rectus femoris,vastus lateralis,vastus medialis,and vastus intermedius

A) insert on the calcaneus.
B) flex the leg at the knee.
C) are antagonistic to the quadriceps femoris.
D) are the muscles of the quadriceps femoris.

Question 12

Which of the following is not a facial muscle?

A) orbicularis oculi
B) zygomaticus
C) sternocleidomastoid
D) frontalis

Question 13

Actin is

A) located within the neuromuscular junction.
B) contractile protein that is called a thin filament.
C) called the thick filament.
D) stored within the sarcoplasmic reticulum.

Question 14

The orbicularis oris muscle

A) surrounds the mouth.
B) flexes the head.
C) is the smiling muscle.
D) closes the eye.

Question 15

The levator palpebrae superioris

A) purses the lips.
B) allows one to whistle.
C) raises the eyelids.
D) wiggles the nose.

Question 16

The smiling muscle is the

A) buccinator.
B) zygomaticus.
C) frontalis.
D) orbicularis oris.

Question 17

This group of muscles moves the arm at the shoulder.

A) quadriceps femoris group
B) hamstrings
C) rotator cuff muscles
D) muscles of mastication

Question 18

Which of the following forms crossbridges with actin?

A) sarcoplasmic reticulum
B) T-tubules
C) myosin
D) sarcolemma

Question 19

Which muscle is located in the lower extremities?

A) peroneus longus
B) latissimus dorsi
C) serratus anterior
D) pectoralis major

Question 20

This group of muscles is located on the posterior thigh.

A) rotator cuff muscles
B) quadriceps femoris
C) hamstrings
D) muscles of mastication

Question 21

Where is the vastus lateralis located?

A) upper arm
B) thigh
C) chest
D) back

Question 22

Which muscle are you using as you turn your head to the left and then to the right?

A) sternocleidomastoid
B) frontalis
C) pectoralis major
D) diaphragm

Question 23

The sarcoplasmic reticulum

A) stores ACh.
B) is located within the neuromuscular junction.
C) envelops the sarcomere-containing myofibrils.
D) is a contractile protein.

Question 24

Which of the following "muscle words" refers to chest?

A) rectus
B) latissimus
C) vastus
D) pectoralis

Question 25

This muscle separates the thoracic and abdominal cavities and is also the chief breathing muscle.

A) serratus anterior
B) intercostal muscle
C) sternocleidomastoid
D) diaphragm

Question 26

The gastrocnemius and the soleus are commonly called the

A) swimmer's muscles.
B) toe dancer's muscles.
C) muscles of mastication.
D) trumpeter's muscles.

Question 27

Acetylcholine is released from the prejunctional membrane in response to the

A) nerve impulse.
B) binding of the myosin heads to actin.
C) release of calcium from the sarcoplasmic reticulum.
D) inactivation of acetylcholinesterase.

Question 28

This muscle lies along the anterior surface of the humerus and acts synergistically with the brachialis and brachioradialis to flex the arm at the elbow.

A) deltoid
B) triceps brachii
C) biceps brachii
D) latissimus dorsi

Question 29

Which muscle covers the shoulder like a shoulder pad?

A) deltoid
B) trapezius
C) biceps brachii
D) sternocleidomastoid

Question 30

These muscles are located on the inner (medial)surface of the thigh and move the thigh toward the midline of the body.

A) gastrocnemius
B) quadriceps femoris
C) adductors
D) sartorius

Question 31

"Make like a scarecrow" by contracting this muscle.

A) frontalis
B) trapezius
C) latissimus dorsi
D) deltoid

Question 32

What is the function of the masseter muscle?

A) adducts the thigh
B) chews food
C) lifts the eyelid
D) flexes the arm

Question 33

This structure is an extension of the sarcolemma or cell membrane;it penetrates the interior of the muscle and carries the electrical signal to the deepest part of the muscle.

A) sarcoplasmic reticulum
B) T-tubule
C) Z line
D) tendon

Question 34

Which of the following describes a muscle that remains in a contracted state?

A) twitch
B) tetany
C) atrophy
D) hypertrophy

Question 35

Which of the following is responsible for muscle relaxation?

A) The sarcomere runs out of ATP.
B) Calcium floods the area of the sarcomere,allowing for the interaction of actin and myosin.
C) Calcium is pumped back into the sarcoplasmic reticulum.
D) Acetylcholinesterase in the neuromuscular junction is depleted.

Question 36

What is the name of the cord of connective tissue that connects muscle to bone?

A) ligament
B) tendon
C) linea alba
D) aponeurosis

Question 37

Joey has had his leg in a nonweight-bearing cast for 8 weeks.When the cast is removed,the leg appears smaller than the uninjured leg.Which term best describes this observation?

A) contracture
B) hypertrophy
C) muscle dystrophy
D) disuse atrophy

Question 38

Which of the following is a series of contractile units that make up each myofibril;each unit extends from Z line to Z line?

A) sarcomere
B) synapse
C) fascicle
D) sarcoplasmic reticulum

Question 39

What is the site of calcium storage in a relaxed skeletal muscle?

A) T-tubule
B) neuromuscular junction
C) fascicle
D) sarcoplasmic reticulum

Question 40

This muscle is located in the upper back and posterior neck region;contraction of this muscle causes you to look up at the sky.

A) pectoralis major
B) sternocleidomastoid
C) trapezius
D) diaphragm

Question 41

Which group is incorrect?

A) muscles in lower extremities:hamstrings,quadriceps,gastrocnemius
B) muscles involved in breathing:diaphragm,intercostals,hamstrings
C) terms that describe the muscle activity of a whole muscle:twitch and tetany
D) muscles in the upper extremities:triceps brachii,biceps brachii,pronator

Question 42

The Achilles tendon attaches the soleus and this muscle to the calcaneus.

A) sartorius
B) quadriceps femoris
C) gastrocnemius
D) vastus lateralis

Question 43

On which large muscle do you sit?

A) latissimus dorsi
B) gastrocnemius
C) gluteus maximus
D) rectus femoris

Question 44

With regard to skeletal muscle contraction,which event comes first?

A) crossbridge formation between actin and myosin
B) release of calcium from the sarcoplasmic reticulum
C) activation of the NM receptor within the neuromuscular junction
D) release of neurotransmitter (ACh)from the somatic motor neuron

Question 45

The force of muscle contraction is most related to the

A) amount of calcium that is stored within the sarcoplasmic reticulum.
B) amount of neurotransmitter released from the prejunctional vesicles.
C) numbers of crossbridges formed between actin and myosin.
D) size of the somatic motor neuron.

Question 46

Which group is incorrect?

A) dysfunction at the neuromuscular junction:botulism,myasthenia gravis
B) contractile proteins:thin filaments,myosin,aponeurosis
C) terms that describe the muscle activity of a whole muscle:twitch and tetany
D) movements:flexion,supination,abduction

Question 47

Which of the following increases the force of contraction of a whole muscle?

A) twitch
B) contracture
C) ossification
D) recruitment

Question 48

This muscle lies along the posterior surface of the upper arm;it extends the forearm and is used to bear weight in crutch walking.

A) biceps brachii
B) biceps femoris
C) deltoid
D) triceps brachii

Question 49

The rectus,transversus,internal oblique,and the external oblique refer to

A) smooth muscles.
B) abdominal muscles.
C) breathing muscles.
D) muscles that are located on the back and work synergistically with the latissimus dorsi.

Question 50

Which group is incorrect?

A) types of striated muscle:skeletal,cardiac,smooth
B) movements:extension,pronation,adduction
C) movements:flexion,supination,abduction
D) muscles of the face:frontalis,buccinator,masseter

Question 51

With regard to skeletal muscle contraction,which event comes last?

A) shortening of the sarcomere
B) release of calcium from the sarcoplasmic reticulum
C) activation of the NM receptors by ACh
D) release of neurotransmitter (ACh)from the somatic motor neuron