Transcript 09_ClickerQuestionsPRS

Chapter
9
The Muscular
System: Skeletal
Muscle Tissue
and Muscle
Organization
PowerPoint® Lecture Slides
prepared by Agnes Yard and
Michael Yard
Copyright © 2008 Pearson Education, Inc., publishing as Benjamin Cummings
Copyright © 2008 Pearson Education, Inc.,
publishing as Pearson Benjamin Cummings
Levers can change which of the following?
a. the direction of an applied force
b. the distance and speed of movement
produced by a force
c. the strength of a force
d. all of the above
Copyright © 2008 Pearson Education, Inc., publishing as Benjamin Cummings
Regarding muscle terminology, which of the following
indicates a “bandage-like” appearance?
a. splenius
b. serratus
c. sartorius
d. piriformis
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A skeletal muscle contracts when its motor units are
stimulated; the amount of tension produced depends
upon which of the following?
a. the frequency of stimulation
b. the number of motor units involved
c. the amount of muscle spindles activated
d. a and b
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When the triceps brachii muscle acts in stabilizing the
flexion movement of the biceps brachii muscle, it is
acting as a/an:
a. synergist
b. antagonist
c. fixator
d. agonist
Copyright © 2008 Pearson Education, Inc., publishing as Benjamin Cummings
Which connective tissue(s) of skeletal muscle contain(s)
the nerves and blood vessels that supply the muscle
fibers?
a. epimysium
b. perimysium
c. endomysium
d. all of the above
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In performing plantar flexion, the calf muscles act
across which type of lever?
a. first-class lever, in which the fulcrum lies between
the applied force and the resistance
b. second-class lever, in which the resistance is
located between the applied force and the fulcrum
c. third-class lever, in which the force is applied
between the applied force and the fulcrum
d. first-class lever, in which the resistance is located
between the applied force and the fulcrum
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Within a sarcomere, the region between the A band and
the Z line containing only thin filaments is the:
a. H band
b. I band
c. M line
d. zone of overlap
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Most of the skeletal muscles of the body display which
pattern of fascicle arrangement?
a. convergent muscle
b. pennate muscle
c. circular muscle
d. parallel muscle
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Which of the following plays an essential role in
controlling the contraction of individual myofibrils?
a. sarcoplasmic reticulum
b. transverse tubules
c. sarcolemma
d. myosatellite cells
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T tubules are formed by deep indentation in which
cellular structure?
a. nuclear envelope
b. sarcolemma
c. sarcoplasmic reticulum
d. neuromuscular junction
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In neuromuscular synapses, which event or description
applies to the synaptic cleft?
a. It contains numerous mitochondria and small
secretory vesicles.
b. When an electrical impulse arrives at the
synaptic cleft, acetylcholine is released.
c. It contains the acetylcholinesterase enzyme.
d. When acetylcholine binds to its receptors at
the synaptic cleft, a change in the local
transmembrane potential is initiated.
Copyright © 2008 Pearson Education, Inc., publishing as Benjamin Cummings
Which of the following is/are not characteristic of fast
fibers?
a. high resistance to fatigue
b. few mitochondria
c. supported by anaerobic glycolysis
d. low myoglobin content
Copyright © 2008 Pearson Education, Inc., publishing as Benjamin Cummings
Which type of muscle is versatile in that the direction of
pull can be changed by stimulating only one group of
muscle cells at any one time?
a. multipennate
b. bipennate
c. convergent
d. none of the above
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The cytoplasm of the synaptic terminal at the
neuromuscular synapse contains numerous small
secretory vesicles filled with which neurotransmitter?
a. serotonin
b. dopamine
c. acetylcholine
d. acetylcholinesterase
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Regarding the sliding filament theory, the tension
produced by the muscle fiber is related directly to which
of the following?
a. the length of the muscle fiber
b. the strength of cross-bridges that occur in
the fiber
c. the structure of an individual sarcomere
d. the amount of calcium ions in the T tubules
of the muscle fiber
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Which of the following statements regarding aging and
the muscular system is true?
a. The rate of decline in muscular performance is the
same in all individuals, regardless of exercise patterns
or lifestyle.
b. Skeletal muscle fibers contain less ATP but more
glycogen reserves as they age, resulting in a tendency
to fatigue rapidly.
c. The number of myosatellite cells steadily increases
with age, so that scar tissue formation usually results
from muscle tissue injury.
d. Skeletal muscles become smaller in diameter and
more elastic as the amount of fibrous connective
tissue decreases.
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Which of the following statements regarding myofibrils
is inaccurate?
a. The combination of a pair of terminal cisternae plus a
transverse tubule is known as a triumvirate.
b. Mitochondria and glycogen granules are scattered
among the myofibrils.
c. Each myofibril is a cylindrical structure 1–2 μm in
diameter and as long as the entire cell.
d. Surrounding each myofibril is a sleeve made up of
membranes of the sarcoplasmic reticulum.
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Regarding muscle terminology, which of the following
terms indicates that the muscle is “long and round?”
a. teres
b. pectinate
c. longissimus
d. tendinosus
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Which of the following is not a function of skeletal
muscle?
a. It provides voluntary control over swallowing,
defecation, and urination, regulating the entrance and
exiting of material.
b. It supports soft tissues, such as visceral organs, and
protects internal tissues from injury.
c. It moves substances through the digestive system.
d. It maintains posture and body position.
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When cross-bridge binding occurs during a muscle
contraction, which of the following structures pivots
toward the M line?
a. the Z line
b. the myosin head
c. the H band
d. the troponin–tropomyosin complex
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Which of the following statements regarding the
distribution of various types of skeletal muscle fibers is
correct?
a. Most muscles contain a mixture of fiber types,
although all of the fibers within one motor unit are of
the same type.
b. There are no red fibers in the muscles of the eye or
hand, where swift, brief contractions are required.
c. Training for endurance events increases the
proportion of fast fibers in the active muscles.
d. a and b
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Which of the following is/are factors that help return a
shortened muscle to its normal length?
a. gravity
b. elastic fibers in the epimysium, perimysium,
and endomysium
c. the pull of other muscles
d. all of the above
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Which of the following statements regarding third-class
levers is true?
a. A force is applied between the resistance
and the fulcrum.
b. They are the most common levers in the
body.
c. Both statements are true.
d. Neither statement is true.
Copyright © 2008 Pearson Education, Inc., publishing as Benjamin Cummings
Which of the following is not correct regarding the
gross anatomy of skeletal muscles?
a. Each muscle fiber has one neuromuscular synapse,
usually located midway along its length.
b. An extensive vascular supply enters the muscle
alongside the associated nerves; and the vessels and
nerves follow the same unbranched pattern through
the perimysium.
c. At each end of the muscle, the collagen fibers of the
epimysium, perimysium, and endomysium often
converge to form a fibrous tendon.
d. The epimysium surrounds the entire skeletal muscle
and is connected to the deep fascia.
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What is the term for resting tension in a skeletal
muscle?
a. hypertrophy
b. recruitment
c. multiple motor unit summation
d. muscle tone
Copyright © 2008 Pearson Education, Inc., publishing as Benjamin Cummings