BSC 2085: Muscular System Exam Questions and
Answers 100% Pass
Muscle that has a striped appearance is described as being ________.
a) elastic
b) nonstriated
c) excitable
d) striated - ✔✔d) striated
Which element is important in directly triggering contractions?
a) sodium (Na+)
b) calcium (Ca++)
c) potassium (K+)
d) chloride (Cl-) - ✔✔b) calcium (Ca++)
Which of the following properties is not common to all three muscle tissues?
a) excitability
b) the need for ATP
c) at rest, uses shielding proteins to cover actin-binding sites
d) elasticity - ✔✔c) at rest, uses shielding proteins to cover actin-binding sites
The correct order for the smallest to the largest unit of organization in muscle tissue is ________.
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,a) fascicle, filament, muscle fiber, myofibril
b) filament, myofibril, muscle fiber, fascicle
c) muscle fiber, fscicle, filament, myofibril
d) myofibril, muscle fiber, filament, fascicle - ✔✔b) filament, myofibril, muscle fiber, fascicle
Depolarization of the sarcolemma means ________.
a) the inside of the membrane has become less
negative as sodium ions accumulate
b) the outside of the membrane has become less
negative as sodium ions accumulate
c) the inside of the membrane has become more
negative as sodium ions accumulate
d) the sarcolemma has completely lost any electrical
charge - ✔✔a) the inside of the membrane has become less negative as sodium ions accumulate
In relaxed muscle, the myosin-binding site on actin is
blocked by ________.
a) titin
b) troponin
c) myoglobin
d) tropomyosin - ✔✔d) tropomyosin
According to the sliding filament model, binding sites on actin open when ________.
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, a) creatine phosphate levels rise
b) ATP levels rise
c) acetylcholine levels rise
d) calcium ion levels rise - ✔✔d) calcium ion levels rise
The cell membrane of a muscle fiber is called ________.
a) myofibril
b) sarcolemma
c) sarcoplasm
d) myofilament - ✔✔b) sarcolemma
Muscle relaxation occurs when ________.
a) calcium ions are actively transported out of the sarcoplasmic reticulum
b) calcium ions diffuse out of the sarcoplasmic reticulum
c) calcium ions are actively transported into the sarcoplasmic reticulum
d) calcium ions diffuse into the sarcoplasmic reticulum - ✔✔c) calcium ions are actively transported into
the sarcoplasmic reticulum
During muscle contraction, the cross-bridge detaches
when ________.
a) the myosin head binds to an ADP molecule
b) the myosin head binds to an ATP molecule
c) calcium ions bind to troponin
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Answers 100% Pass
Muscle that has a striped appearance is described as being ________.
a) elastic
b) nonstriated
c) excitable
d) striated - ✔✔d) striated
Which element is important in directly triggering contractions?
a) sodium (Na+)
b) calcium (Ca++)
c) potassium (K+)
d) chloride (Cl-) - ✔✔b) calcium (Ca++)
Which of the following properties is not common to all three muscle tissues?
a) excitability
b) the need for ATP
c) at rest, uses shielding proteins to cover actin-binding sites
d) elasticity - ✔✔c) at rest, uses shielding proteins to cover actin-binding sites
The correct order for the smallest to the largest unit of organization in muscle tissue is ________.
Page 1/17
©EmilyCharlene 2024. All Rights Reserved.
,a) fascicle, filament, muscle fiber, myofibril
b) filament, myofibril, muscle fiber, fascicle
c) muscle fiber, fscicle, filament, myofibril
d) myofibril, muscle fiber, filament, fascicle - ✔✔b) filament, myofibril, muscle fiber, fascicle
Depolarization of the sarcolemma means ________.
a) the inside of the membrane has become less
negative as sodium ions accumulate
b) the outside of the membrane has become less
negative as sodium ions accumulate
c) the inside of the membrane has become more
negative as sodium ions accumulate
d) the sarcolemma has completely lost any electrical
charge - ✔✔a) the inside of the membrane has become less negative as sodium ions accumulate
In relaxed muscle, the myosin-binding site on actin is
blocked by ________.
a) titin
b) troponin
c) myoglobin
d) tropomyosin - ✔✔d) tropomyosin
According to the sliding filament model, binding sites on actin open when ________.
Page 2/17
©EmilyCharlene 2024. All Rights Reserved.
, a) creatine phosphate levels rise
b) ATP levels rise
c) acetylcholine levels rise
d) calcium ion levels rise - ✔✔d) calcium ion levels rise
The cell membrane of a muscle fiber is called ________.
a) myofibril
b) sarcolemma
c) sarcoplasm
d) myofilament - ✔✔b) sarcolemma
Muscle relaxation occurs when ________.
a) calcium ions are actively transported out of the sarcoplasmic reticulum
b) calcium ions diffuse out of the sarcoplasmic reticulum
c) calcium ions are actively transported into the sarcoplasmic reticulum
d) calcium ions diffuse into the sarcoplasmic reticulum - ✔✔c) calcium ions are actively transported into
the sarcoplasmic reticulum
During muscle contraction, the cross-bridge detaches
when ________.
a) the myosin head binds to an ADP molecule
b) the myosin head binds to an ATP molecule
c) calcium ions bind to troponin
Page 3/17
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