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WorksheetsHonors Physiology Muscular System
Total questions: 41
Worksheet time: 21mins
Name
Class
Date
1.
Which of the following are called muscle fibers?
a)
smooth and cardiac muscle
b)
smooth and skeletal muscle
c)
cardiac and skeletal muscle
d)
all of these
2.
Which of the following are properties of muscles?
a)
excitability
b)
contractility
c)
extensibility
d)
all of these
3.
consists of hundreds to thousands of muscle fibers, plus connective tissue, nerves, and blood vessels
a)
muscle
b)
fascicle
c)
muscle fiber
d)
myofibril
4.
contractile filament; may be thick or thin
a)
myofibril
b)
fascicle
c)
sarcomere
d)
myofilament
5.
a discrete bundle of muscle fibers
a)
fascicle
b)
myofibril
c)
sarcomere
d)
myofilament
6.
a rod-like contractile organelle
a)
fascicle
b)
myofibril
c)
sarcomere
d)
myofilament
7.
the smallest contractile unit of a myofibril
a)
fascicle
b)
sarcomere
c)
myofilament
d)
myosin
8.
connective tissue sheath that wraps entire muscle
a)
endomysium
b)
perimysium
c)
epimysium
9.
connective tissue sheath that wraps a fascicle
a)
epimysium
b)
perimysium
c)
endomysium
10.
connective tissue sheath that wraps one muscle fiber
a)
epimysium
b)
perimysium
c)
endomysium
11.
attachment of muscle that serves as the anchor
a)
origin
b)
insertion
12.
muscle fiber plasma membrane
a)
sarcoplasm
b)
sarcolemma
c)
sarcoplasmic reticulum
d)
SR
13.
a red pigment that stores oxygen in a muscle
a)
hemoglobin
b)
myoglobin
c)
myosin
d)
actin
14.
a rod-shaped protein, found in actin, that blocks the binding site
a)
troponin
b)
tropomyosin
c)
myosin
d)
globulin
15.
a protein that helps to position tropomyosin on the actin filament
a)
globulin
b)
myoglobin
c)
troponin
d)
dystrophin
16.
regulates calcium ion levels in the muscle cell
a)
sarcolemma
b)
sarcoplasmic reticulum
c)
sarcoplasm
17.
Ion channels found on sarcolemma
a)
Na + and K +
b)
Na + only
c)
Ca +
d)
Ca + and K +
18.
protrudes deep into muscle fiber to carry action potential to every last sarcomere
a)
traid
b)
T tubule
c)
sarcolemma
d)
SR
19.
states that during a muscle contraction, thin filaments slide past thick filaments and overlap to a greater degree
a)
Sliding Filament Theory of Contraction
b)
Excitation-Contraction Coupling
c)
Nerve Stimulus Theory
d)
Acetycholine Theory of Muscle Activity
20.
An electrical current propagated along a nerve or muscle cell
a)
depolarization
b)
repolarization
c)
action potential
d)
end plate potential
21.
Where a motor neuron axon meets a muscle fiber
a)
synapse
b)
neuromuscular junction
c)
cleft
d)
acetylcholinesterase
22.
the physical space that exists between a nerve and muscle cell
a)
neuromuscular junction
b)
synaptic cleft
c)
receptor
d)
imbalance
23.
the enzyme that breaks down acetylcholine after a contraction
a)
dopamase
b)
epinase
c)
acetylcholinesterase
d)
digestase
24.
A transient change in membrane potential that makes the interior of the sarcolemma become less negative
a)
depolarization
b)
repolarization
c)
hyperpolarization
25.
Once acetylcholine binds to a muscle cell receptor, what is the first event to occur?
a)
voltage-gated Na+ ion channels open, and Na+ moves out
b)
voltage-gated Na+ ion channels open, and Na+ moves in
c)
voltage-gated K+ ion channels open, and K+ moves out
d)
voltage-gated K+ ion channels open, and K+ moves in
26.
After the muscle fiber's depolarization, a voltage of +30 mV is reached. What is the next event to occur?
a)
voltage-gated Na+ ion channels open, and Na+ moves out
b)
voltage-gated Na+ ion channels open, and Na+ moves in
c)
voltage-gated K+ ion channels open, and K+ moves out
d)
voltage-gated K+ ion channels open, and K+ moves in
27.
To restore the resting ionic conditions of the muscle after a contraction, which of the following must happen?
a)
The Na+/K+ pump must move Na in and K out
b)
The Na+/K+ pump must move Na out and K in
28.
Once an action potential is propagated down the T tubule, why must the SR release CA2+ ions?
a)
the Ca ions must bind to the myosin
b)
the Ca ions must bind to the actin
c)
the Ca ions must bind to the tropomyosin, moving the troponin complex out of the way
d)
the Ca ion must bind to the troponin complex, allowing it to move the tropomyosin out of the way
29.
What is required in order to allow the myosin head to bind to the actin binding site?
a)
glucose
b)
glycogen
c)
ATP
d)
the Na+/K+ pump
30.
Which of the following contractions makes a muscle shorter?
a)
isotonic
b)
isometric
31.
Which of the following contractions makes a muscle increase its tension only?
a)
isotonic
b)
isometric
32.
Uses oxygen to break down glucose
a)
direct phosphorylation
b)
anaerobic glycolysis
c)
aerobic respiration
33.
Breaks down glucose in the absence of oxygen; results in the production of lactic acid
a)
aerobic respiration
b)
anaerobic glycolysis
c)
direct phosphorylation
34.
Uses creatine phosphate and ADP to create one molecule of ATP
a)
aerobic respiration
b)
anaerobic glycolysis
c)
direct phosphorylation
35.
oxygen required for a muscle to return to its resting state after vigorous exercise
a)
direct phosphorylation
b)
oxygen debt
c)
myoglobin debt
d)
mitochondria
36.
Results in muscle hypertrophy
a)
aerobic exercise
b)
anaerobic exercise
c)
both
37.
Results in new capillaries and an increased blood supply
a)
aerobic exercise
b)
anaerobic exercise
c)
both
38.
Results in an increase in both myoglobin and mitochondria
a)
aerobic exercise
b)
anaerobic exercise
c)
both
39.
Increases the number of mitochondria found in your muscles
a)
aerobic exercise
b)
anaerobic exercise
c)
both
40.
Would be used for a moderate exercise, like a leisurely swim, slow jog, or yoga.
a)
fast glycolytic fibers
b)
slow oxidative fibers
c)
fast oxidative fibers
41.
Would be used in weight lifting
a)
slow oxidative fibers
b)
fast oxidative fibers
c)
fast glycolytic fibers
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