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Multiple Choice Quiz
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1
The layer of connective tissue that separates the muscle tissue into small sections is called the ______________.
A)aponeuroses
B)epimysium
C)perimysium
D)endomysium
2
The segment of a myofibril that is called a sarcomere runs from _______________.
A)one Z line to the next Z line
B)one H zone to the next H zone
C)one A band to the next A band
D)one end of a skeletal muscle to the opposite end
3
The ______________ are an invagination of the muscle cell's sarcolemma.
A)sarcoplasmic reticula
B)transverse (T) tubules
C)cisternae
D)microtubules
4
Into what does the neuron release its neurotransmitter at the neuromuscular junction?
A)motor end plate
B)cytoplasm of the muscle cell
C)cisternae
D)synaptic cleft
5
A motor unit is made up of _______________.
A)all the muscle fibers within a given muscle
B)a motor neuron and the muscle fibers it innervates
C)all the neurons going into an individual section of the body
D)a fascicle and a nerve
6
The crossbridges involved in muscle contraction are located on the ________________.
A)myosin myofilaments
B)actin myofilaments
C)tropomyosin
D)dystrophin
7
Which of these statements is correct regarding muscle contraction?
A)All motor units act together.
B)Muscle contraction continues for long periods after nervous stimulation ceases.
C)The crossbridges bind to the actin and shorten the sarcomeres.
D)Dystrophin is not needed to strengthen the contracting muscle cell.
8
When a nervous impulse travels from a neuron to a muscle cell, what happens next?
A)The impulse travels over the sarcolemma in all directions.
B)Calcium is released from the sarcoplasmic reticulum.
C)Linkages form between the actin and myosin.
D)Acetylcholine is decomposed by acetylcholinesterase.
9
One of the following statements about muscular responses is not true. Choose that one.
A)A muscle fiber contracts in an all-or-none fashion.
B)There is a slight latent period that occurs between when the stimulus arrives at the muscle and when the muscle contracts.
C)Muscles will add motor units to a contraction, increasing the overall force of contraction.
D)When a person is fully at rest, none of her muscles are contracting.
10
The type of muscle found in the irises of the eyes and in the blood vessels is called _______________.
A)visceral smooth muscle
B)multiunit smooth muscle
C)cardiac muscle
D)skeletal muscle
11
Why can cardiac muscle fibers contract for longer periods than skeletal muscle fibers?
A)Cardiac muscle is self-excitatory.
B)Extracellular calcium partially controls the strength (and length) of contraction.
C)Cisternae of T-tubules is more developed in cardiac muscle.
D)Cardiac muscle is uninucleate rather than multinucleate.
12
Which muscle enables you to pucker your lips for a kiss?
A)epicranius
B)buccinator
C)orbicularis oris
D)orbicularis oculi
13
The muscle that enables you to elevate and adduct your scapula is the ____________.
A)serratus anterior
B)sternocleidomastoid
C)splenius capitis
D)rhomboideus major
14
Which muscle is the strongest flexor of the elbow?
A)brachialis
B)biceps brachii
C)brachioradialis
D)deltoid
15
The biceps femoris is one hamstring muscle located on the back of the thigh. Which muscle is another hamstring?
A)adductor magnus
B)semitendinosus
C)gluteus maximus
D)quadriceps femoris
16
Which of the following does not belong with the others?
A)multinucleated
B)skeletal
C)striated
D)involuntary
17
Each muscle fiber is directly surrounded by connective tissue called the _____.
A)perimysium
B)fascia
C)endomysium
D)epimysium
18
Which term is the smallest subdivision in this group?
A)fiber
B)fibril
C)filament
D)actin
19
Which description of muscle contraction means that all of the fibers within a muscle are fully contracted?
A)all-or-none law
B)summation
C)tetanic
D)muscle twitching
20
The term _____ refers to the constant state of contraction of a certain number of fibers within a muscle.
A)atrophy
B)hypertrophy
C)summation
D)tone
21
Muscles that are not used, may degenerate or undergo a process of _____.
A)atrophy
B)hypertrophy
C)fatigue
D)tetany
22
Muscles that act to cause similar movements are called _____.
A)antagonists
B)origins
C)insertions
D)synergists
23
The major muscle lining the cheek is the _____.
A)orbicularis oculi
B)orbicularis oris
C)zygomaticus
D)buccinator
24
The triangle shaped muscle which antagonizes the sternocleidomastoid is the _____.
A)deltoid
B)pectoralis major
C)external oblique
D)trapezius
25
The antagonist to the triceps brachii is the _____.
A)deltoid
B)pectoralis major
C)brachialis
D)serratus anterior







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