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Chapter 6 – Muscle Tissue
Myofibrils
What, Why,
and Where
of Muscles
Cardiac or
Smooth
Muscle
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Muscle
Function
Associated
Structures
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FINAL ROUND
Topic 1: Muscle Function
$100 Question
Which of the following is NOT a major function of
skeletal muscle?
a.
b.
c.
d.
maintaining body temperature
lining hollow organs
maintaining posture
storing nutrient reserves
ANSWER
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Topic 1: Muscle Function
$100 Answer
Which of the following is NOT a major function of
skeletal muscle?
a.
b.
c.
d.
maintaining body temperature
lining hollow organs
maintaining posture
storing nutrient reserves
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Topic 1: Muscle Function
$200 Question
Which activity would be more likely to create an
oxygen debt: swimming laps or lifting weights?
a.
b.
c.
d.
swimming laps
lifting weights
both A and B
neither A nor B
ANSWER
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Topic 1: Muscle Function
$200 Answer
Which activity would be more likely to create an
oxygen debt: swimming laps or lifting weights?
a.
b.
c.
d.
swimming laps
lifting weights
both A and B
neither A nor B
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Topic 1: Muscle Function
$300 Question
How would a drug that blocks acetylcholine
release affect muscle contraction?
a.
b.
c.
d.
Contraction would be prevented.
Contraction would be slowed.
The speed of contraction would increase.
The strength of contraction would increase.
ANSWER
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Topic 1: Muscle Function
$300 Answer
How would a drug that blocks acetylcholine
release affect muscle contraction?
a.
b.
c.
d.
Contraction would be prevented.
Contraction would be slowed.
The speed of contraction would increase.
The strength of contraction would increase.
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Topic 1: Muscle Function
$400 Question
What statement(s) below are FALSE with regard
to the contraction of skeletal muscle?
a. Through eccentric contractions, the muscle
lengthens.
b. Through concentric contractions, the muscle
does not change length.
c. Through isometric contraction, the muscle
remains the same length.
ANSWER
d. A and C are correct.
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Topic 1: Muscle Function
$400 Answer
What statement(s) below are FALSE with regard to
the contraction of skeletal muscle?
a. Through eccentric contractions, the muscle
lengthens.
b. Through concentric contractions, the muscle
does not change length.
c. Through isometric contraction, the muscle
remains the same length.
d. A and C are correct.
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Topic 1: Muscle Function
$500 Question
Which of the following describe the characteristics of
slow muscle fibers?
a. small diameter, rich in myoglobin, and high
glycogen reserve
b. large diameter, very vascular, and multiple
mitochondria
c. small diameter, rich in myoglobin, and very
vascular
d. large diameter, high glycogen reserve,
ANSWER
and lack significant myoglobin
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Topic 1: Muscle Function
$500 Answer
Which of the following describe the characteristics of
slow muscle fibers?
a. small diameter, rich in myoglobin, and high
glycogen reserve
b. large diameter, very vascular, and multiple
mitochondria
c. small diameter, rich in myoglobin, and very
vascular
d. large diameter, high glycogen reserve,
and lack significant myoglobin
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Topic 2: Associated Structures
$100 Question
How would severing the tendon attached to a muscle
affect the muscle’s ability to move a body part?
a. Uncontrolled movement would result from a
severed tendon.
b. Movement would be greatly exaggerated with no
tendon.
c. No movement is possible without a muscle to
bone connection.
ANSWER
d. Limited movement would result.
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Topic 2: Associated Structures
$100 Answer
How would severing the tendon attached to a muscle
affect the muscle’s ability to move a body part?
a. Uncontrolled movement would result from a
severed tendon.
b. Movement would be greatly exaggerated with no
tendon.
c. No movement is possible without a muscle to
bone connection.
d. Limited movement would result.
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Topic 2: Associated Structures
$200 Question
Which of the following describes the neuromuscular
junction?
a. the surface containing membrane receptors that bind
acetylcholine
b. special intercellular connection between axon
branches and a skeletal muscle fiber
c. the link between generation of an action potential and
the start of muscle contraction
d. a propagated change in membrane potential that
travels the length of an axon
ANSWER
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Topic 2: Associated Structures
$200 Answer
Which of the following describes the neuromuscular
junction?
a. the surface containing membrane receptors that bind
acetylcholine
b. special intercellular connection between axon
branches and a skeletal muscle fiber
c. the link between generation of an action potential and
the start of muscle contraction
d. a propagated change in membrane potential that
travels the length of an axon
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Topic 2: Associated Structures
$300 Question
How are epimysium, perimysium, and
endomysium interrelated?
a. They are connective tissues and blend
with tendons to provide firm attachments to
bone.
b. All three contain capillaries and nerves.
c. All three contain satellite cells that function in
the repair of muscle tissue.
ANSWER
d. None of the above are correct.
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Topic 2: Associated Structures
$300 Answer
How are epimysium, perimysium, and
endomysium interrelated?
a. They are connective tissues and blend
with tendons to provide firm attachments
to bone.
b. All three contain capillaries and nerves.
c. All three contain satellite cells that function in
the repair of muscle tissue.
d. None of the above are correct.
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Topic 2: Associated Structures
$400 Question
With excitation–contraction coupling,
a. a motor neuron releases ACh, which allows an
electrical event to be transferred to the muscular
system.
b. a motor neuron releases ACh, and it binds to
receptors on the motor end plate of a muscle
fascicle.
c. the myosin cross-bridge will remain attached to actin
as ATP depletion occurs.
ANSWER
d. ACh release reveals actin’s binding
site for myosin to bind.
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Topic 2: Associated Structures
$400 Answer
With excitation–contraction coupling,
a. a motor neuron releases ACh, which allows an
electrical event to be transferred to the
muscular system.
b. a motor neuron releases ACh, and it binds to
receptors on the motor end plate of a muscle
fascicle.
c. the myosin cross-bridge will remain attached to
actin as ATP depletion occurs.
d. ACh release reveals actin’s binding
site for myosin to bind.
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Topic 2: Associated Structures
$500 Question
A motor unit is/are _____. You would need a small
motor unit to control movement of the fingers _____.
a. the resting tension in a muscle; so it would not
involve muscle fibers of adjoining fingers
b. muscle fibers controlled by a single motor neuron;
because you need precise control
c. the addition of one twitch to another; because you
need twitches to cover a large area
ANSWER
d. None of the above are correct.
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Topic 2: Associated Structures
$500 Answer
A motor unit is/are _____. You would need a small
motor unit to control movement of the fingers _____.
a. the resting tension in a muscle; so it would not
involve muscle fibers of adjoining fingers
b. muscle fibers controlled by a single motor
neuron; because you need precise control
c. the addition of one twitch to another; because you
need twitches to cover a large area
d. None of the above are correct.
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Topic 3: Myofibrils
$100 Question
Which component of the sarcomere acts as an
ATPase?
a.
b.
c.
d.
actin
myosin
titin
actinin
ANSWER
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Topic 3: Myofibrils
$100 Answer
Which component of the sarcomere acts as an
ATPase?
a.
b.
c.
d.
actin
myosin
titin
actinin
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Topic 3: Myofibrils
$200 Question
Why does skeletal muscle appear striated when
viewed through a microscope?
a. Z lines and myosin filaments align within a
muscle fiber.
b. Glycogen reserves are linearly arranged.
c. Capillaries regularly intersect the myofibers.
d. Actin filaments repel stain,
ANSWER
appearing banded.
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Topic 3: Myofibrils
$200 Answer
Why does skeletal muscle appear striated when
viewed through a microscope?
a. Z lines and myosin filaments align within a
muscle fiber.
b. Glycogen reserves are linearly arranged.
c. Capillaries regularly intersect the myofibers.
d. Actin filaments repel stain,
appearing banded.
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Topic 3: Myofibrils
$300 Question
The A band comprises which of the following
subunits?
a.
b.
c.
d.
I band, terminal cisternae, and the Z line
M line, H band, and the zone of overlap
thin filaments, titin, and the Z line
sarcoplasmic reticulum and T tubules
ANSWER
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Topic 3: Myofibrils
$300 Answer
The A band comprises which of the following
subunits?
a.
b.
c.
d.
I band, terminal cisternae, and the Z line
M line, H band, and the zone of overlap
thin filaments, titin, and the Z line
sarcoplasmic reticulum and T tubules
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Topic 3: Myofibrils
$400 Question
Where would you expect the greatest
concentration of Ca2+ in resting skeletal muscle
to be?
a.
b.
c.
d.
in T tubules
surrounding the mitochondria
within sarcomeres
in cisternae of the sarcoplasmic reticulum
ANSWER
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Topic 3: Myofibrils
$400 Answer
Where would you expect the greatest
concentration of Ca2+ in resting skeletal muscle
to be?
a.
b.
c.
d.
in T tubules
surrounding the mitochondria
within sarcomeres
in cisternae of the sarcoplasmic reticulum
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Topic 3: Myofibrils
$500 Question
In what ways does the appearance of a sarcomere
change during contraction of a skeletal muscle
fiber?
a. zones of overlap get larger; H band gets wider;
A bands shorten
b. titin molecules are relaxed; M line disappears
c. Z lines move closer together; I bands and
H bands get smaller
ANSWER
d. None of the above are correct.
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Topic 3: Myofibrils
$500 Answer
In what ways does the appearance of a sarcomere
change during contraction of a skeletal muscle
fiber?
a. zones of overlap get larger; H band gets wider;
A bands shorten
b. titin molecules are relaxed; M line disappears
c. Z lines move closer together; I bands and
H bands get smaller
d. None of the above are correct.
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Topic 4: What, Why, and Where of Muscles
$100 Question
_____ predominate in the large leg muscles of
someone who excels at endurance activities, such as
cycling. This is because _____.
a. Fast fibers; they have large glycogen reserves
b. Slow fibers; they have extensive capillary
networks and more myoglobin
c. Nonvascular fibers; they use both aerobic and
anaerobic metabolism
d. Intermediate fibers; they have more
ANSWER
neuromuscular junctions
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Topic 4: What, Why, and Where of Muscles
$100 Answer
_____ predominate in the large leg muscles of
someone who excels at endurance activities, such as
cycling. This is because _____.
a. Fast fibers; they have large glycogen reserves
b. Slow fibers; they have extensive capillary
networks and more myoglobin
c. Nonvascular fibers; they use both aerobic and
anaerobic metabolism
d. Intermediate fibers; they have more
neuromuscular junctions
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Topic 4: What, Why, and Where of Muscles
$200 Question
Why is an increased level of creatine kinase in a
blood test a diagnostic sign of muscle damage?
a. blood vessels increase production after muscle
damage
b. this enzyme is intracellular, so increasing
extracellular levels indicate damage to cells
c. The liver produces more of this enzyme under
stress.
d. all of the above
ANSWER
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Topic 4: What, Why, and Where of Muscles
$200 Answer
Why is an increased level of creatine kinase in a
blood test a diagnostic sign of muscle damage?
a. blood vessels increase production after muscle
damage
b. this enzyme is intracellular, so increasing
extracellular levels indicate damage to cells
c. The liver produces more of this enzyme under
stress.
d. all of the above
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Topic 4: What, Why, and Where of Muscles
$300 Question
How do muscle fibers elongate and return to
resting length?
a.
b.
c.
d.
elastic forces
opposing muscle contraction
gravity
all the above
ANSWER
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Topic 4: What, Why, and Where of Muscles
$300 Answer
How do muscle fibers elongate and return to
resting length?
a.
b.
c.
d.
elastic forces
opposing muscle contraction
gravity
all the above
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Topic 4: What, Why, and Where of Muscles
$400 Question
What would you expect to happen to a resting
skeletal muscle if the sarcolemma suddenly
became very permeable to Ca2+?
a.
b.
c.
d.
increased strength of contraction
decreased cross-bridge
decreased ability to relax
both A and C
ANSWER
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Topic 4: What, Why, and Where of Muscles
$400 Answer
What would you expect to happen to a resting
skeletal muscle if the sarcolemma suddenly
became very permeable to Ca2+?
a.
b.
c.
d.
increased strength of contraction
decreased cross-bridge
decreased ability to relax
both A and C
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Topic 4: What, Why, and Where of Muscles
$500 Question
Predict what would happen to muscles if a
pesticide that inhibits acetylcholinesterase were
present at the motor end plate.
a. Muscle would lose strength.
b. Muscle would be unable to contract.
c. Acetylcholine receptors would be inactivated in
the motor end plate.
ANSWER
d. Muscle would contract repeatedly.
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Topic 4: What, Why, and Where of Muscles
$500 Answer
Predict what would happen to muscles if a
pesticide that inhibits acetylcholinesterase were
present at the motor end plate.
a. Muscle would lose strength.
b. Muscle would be unable to contract.
c. Acetylcholine receptors would be inactivated in
the motor end plate.
d. Muscle would contract repeatedly.
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Topic 5: Cardiac or Smooth Muscle
$100 Question
Cardiac muscle fibers are more sensitive than
skeletal muscle fibers to which extracellular ion?
a.
b.
c.
d.
sodium
chloride
calcium
iron
ANSWER
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Topic 5: Cardiac or Smooth Muscle
$100 Answer
Cardiac muscle fibers are more sensitive than
skeletal muscle fibers to which extracellular ion?
a.
b.
c.
d.
sodium
chloride
calcium
iron
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Topic 5: Cardiac or Smooth Muscle
$200 Question
Smooth muscle can contract over a wider range
of resting lengths than skeletal muscle can. Why?
a. Smooth muscle sarcomeres are longer.
b. Actin and myosin filament arrangement is
more plastic, allowing greater adaptability.
c. Smooth muscle cells are shorter.
d. Smooth muscle actin is longer.
ANSWER
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Topic 5: Cardiac or Smooth Muscle
$200 Answer
Smooth muscle can contract over a wider range
of resting lengths than skeletal muscle can. Why?
a. Smooth muscle sarcomeres are longer.
b. Actin and myosin filament arrangement is
more plastic, allowing greater adaptability.
c. Smooth muscle cells are shorter.
d. Smooth muscle actin is longer.
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Topic 5: Cardiac or Smooth Muscle
$300 Question
What structural characteristics distinguish cardiac
muscle tissue from skeletal muscle tissue?
Cardiac muscle cells _____.
a. are larger and usually have one nucleus
b. have intercalated discs, short T tubules, and
no triads
c. are dependent on anaerobic metabolism
d. contact each other at tight junctions ANSWER
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Topic 5: Cardiac or Smooth Muscle
$300 Answer
What structural characteristics distinguish cardiac
muscle tissue from skeletal muscle tissue?
Cardiac muscle cells _____.
a. are larger and usually have one nucleus
b. have intercalated discs, short T tubules,
and no triads
c. are dependent on anaerobic metabolism
d. contact each other at tight junctions
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Topic 5: Cardiac or Smooth Muscle
$400 Question
Two cardiologists are talking about functional
characteristics of cardiac muscle tissue. Which of the
following descriptions would they use?
a. special gap junctions, intrinsic conduction system
allows contraction without neural stimulation
b. spindle-shaped, nonstriated, thick filaments scattered,
involuntary
c. striated tissue with multiple mitochondria and a
multinucleated condition syncytium
d. Cardiologists would not use any of this
ANSWER
terminology.
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Topic 5: Cardiac or Smooth Muscle
$400 Answer
Two cardiologists are talking about functional
characteristics of cardiac muscle tissue. Which of the
following descriptions would they use?
a. special gap junctions, intrinsic conduction
system allows contraction without neural
stimulation
b. spindle-shaped, nonstriated, thick filaments scattered,
involuntary
c. striated tissue with multiple mitochondria and a
multinucleated condition syncytium
d. Cardiologists would not use any of this
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terminology.
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Topic 5: Cardiac or Smooth Muscle
$500 Question
Why are cardiac and smooth muscle contractions
more affected by changes in extracellular Ca2+ than
skeletal muscle contractions?
a. Extracellular Ca2+ inhibits actin.
b. Cross-bridges are formed only within the
sarcomeres of cardiac muscle.
c. Most of the calcium for contractions comes from
SR stores.
d. Most of the calcium for contractions
ANSWER
comes from extracellular fluid.
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Topic 5: Cardiac or Smooth Muscle
$500 Answer
Why are cardiac and smooth muscle contractions more
affected by changes in extracellular Ca2+ than skeletal
muscle contractions?
a. Extracellular Ca2+ inhibits actin.
b. Cross-bridges are formed only within the
sarcomeres of cardiac muscle.
c. Most of the calcium for contractions comes from SR
stores.
d. Most of the calcium for contractions
comes from extracellular fluid.
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FINAL ROUND Question
Why would a sprinter experience muscle fatigue before
a marathon runner?
a. Marathon running uses ATP for only a short time,
while sprinting uses ATP indefinitely.
b. Marathon runners’ muscles depend on stored
glycogen; therefore, they do not fatigue.
c. Sprinting involves anaerobic endurance, whereas
running a marathon depends more on availability of
substrates for aerobic respiration.
ANSWER
d. None of the above are correct.
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FINAL ROUND Answer
Why would a sprinter experience muscle fatigue before
a marathon runner?
a. Marathon running uses ATP for only a short time,
while sprinting uses ATP indefinitely.
b. Marathon runners’ muscles depend on stored
glycogen; therefore, they do not fatigue.
c. Sprinting involves anaerobic endurance,
whereas running a marathon depends more on
availability of substrates for aerobic respiration.
d. None of the above are correct.
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