BIO 201 Exam 3 Test Bank Grand Canyon University
Latest Update 2026 | Comprehensive Prep
1. If a drug were to inhibit the function of the sarcoplasmic reticulum, what
effect would this have on muscle contraction?
Muscle contraction would occur more rapidly.
Muscle contraction would not be affected.
Muscle contraction would be impaired due to reduced calcium
release.
Muscle contraction would become stronger.
2. In a sarcomere, the M-line serves as an attachment site for the _______________
filaments and keeps them aligned during contraction and relaxation.
Z
Thick
H
Thin
3. What is the primary role of small motor neurons in muscle function?
They store calcium ions for muscle contraction.
They produce ATP for energy.
They innervate muscle fibers to facilitate contraction.
They connect muscles to bones.
4. The *majority* of body heat is produced by:
exercise
, the kidneys
skeletal muscle
thermolysis
5. During a muscle contraction, the I band:
shortens
stays the same length
disappears
6. What is the role of an antagonist muscle in the muscular system?
To initiate muscle contraction.
To stabilize a joint during movement.
To oppose the action of another muscle.
To assist in the movement of a joint.
7. Describe the role of sarcoplasm in muscle fibers and its significance in
muscle function.
Sarcoplasm is a type of connective tissue that supports muscle fibers.
Sarcoplasm serves as the cytoplasmic matrix that contains
organelles and myofibrils, playing a crucial role in muscle
contraction.
Sarcoplasm is the outer membrane of muscle fibers that protects them
from damage.
Sarcoplasm is the fluid that transports oxygen to muscle cells.
,8. Describe the physiological changes that occur in muscle fibers during
contraction.
During contraction, muscle fibers lengthen and relax, leading to
decreased force.
During contraction, muscle fibers shorten as actin and myosin
filaments slide past each other, resulting in force generation.
During contraction, muscle fibers remain unchanged in length.
During contraction, muscle fibers only increase in size without
generating force.
9. What are the components of a triad in muscle fibers?
T-tubule and two terminal cisternae
Myofibrils and sarcoplasmic reticulum
Sarcomeres and Z-discs
Actin and myosin filaments
10. What initiates the process of excitation in muscle contraction?
ATP hydrolysis
Nerve stimulation
Calcium release
Muscle fiber shortening
11. Describe the role of nerve stimulation in the process of muscle contraction.
Nerve stimulation directly causes muscle fibers to shorten.
Nerve stimulation activates ATP production in muscle cells.
, Nerve stimulation triggers the release of calcium ions, which are
essential for muscle contraction.
Nerve stimulation leads to the synthesis of muscle proteins.
12. Contraction of muscle fibers occur when
the actin and myosin filaments are upregulated
actin replaces myosin
the Z-lines separate and the muscle fiber is shortened
the Z-lines pull together and the muscle fiber is shortened
13. What is the primary function of junctional folds at the neuromuscular
junction?
To protect the muscle fibers from damage.
To store calcium ions for muscle contraction.
To facilitate muscle contraction directly.
To increase the surface area for acetylcholine receptors.
14. If a drug were to block neurotransmitter release at the synaptic cleft, what
effect would this have on muscle contraction?
It would have no effect on muscle contraction.
It would prevent muscle contraction.
It would enhance muscle contraction.
It would cause involuntary muscle contractions.
15. Describe the role of calcium ions in the process of muscle relaxation.
Latest Update 2026 | Comprehensive Prep
1. If a drug were to inhibit the function of the sarcoplasmic reticulum, what
effect would this have on muscle contraction?
Muscle contraction would occur more rapidly.
Muscle contraction would not be affected.
Muscle contraction would be impaired due to reduced calcium
release.
Muscle contraction would become stronger.
2. In a sarcomere, the M-line serves as an attachment site for the _______________
filaments and keeps them aligned during contraction and relaxation.
Z
Thick
H
Thin
3. What is the primary role of small motor neurons in muscle function?
They store calcium ions for muscle contraction.
They produce ATP for energy.
They innervate muscle fibers to facilitate contraction.
They connect muscles to bones.
4. The *majority* of body heat is produced by:
exercise
, the kidneys
skeletal muscle
thermolysis
5. During a muscle contraction, the I band:
shortens
stays the same length
disappears
6. What is the role of an antagonist muscle in the muscular system?
To initiate muscle contraction.
To stabilize a joint during movement.
To oppose the action of another muscle.
To assist in the movement of a joint.
7. Describe the role of sarcoplasm in muscle fibers and its significance in
muscle function.
Sarcoplasm is a type of connective tissue that supports muscle fibers.
Sarcoplasm serves as the cytoplasmic matrix that contains
organelles and myofibrils, playing a crucial role in muscle
contraction.
Sarcoplasm is the outer membrane of muscle fibers that protects them
from damage.
Sarcoplasm is the fluid that transports oxygen to muscle cells.
,8. Describe the physiological changes that occur in muscle fibers during
contraction.
During contraction, muscle fibers lengthen and relax, leading to
decreased force.
During contraction, muscle fibers shorten as actin and myosin
filaments slide past each other, resulting in force generation.
During contraction, muscle fibers remain unchanged in length.
During contraction, muscle fibers only increase in size without
generating force.
9. What are the components of a triad in muscle fibers?
T-tubule and two terminal cisternae
Myofibrils and sarcoplasmic reticulum
Sarcomeres and Z-discs
Actin and myosin filaments
10. What initiates the process of excitation in muscle contraction?
ATP hydrolysis
Nerve stimulation
Calcium release
Muscle fiber shortening
11. Describe the role of nerve stimulation in the process of muscle contraction.
Nerve stimulation directly causes muscle fibers to shorten.
Nerve stimulation activates ATP production in muscle cells.
, Nerve stimulation triggers the release of calcium ions, which are
essential for muscle contraction.
Nerve stimulation leads to the synthesis of muscle proteins.
12. Contraction of muscle fibers occur when
the actin and myosin filaments are upregulated
actin replaces myosin
the Z-lines separate and the muscle fiber is shortened
the Z-lines pull together and the muscle fiber is shortened
13. What is the primary function of junctional folds at the neuromuscular
junction?
To protect the muscle fibers from damage.
To store calcium ions for muscle contraction.
To facilitate muscle contraction directly.
To increase the surface area for acetylcholine receptors.
14. If a drug were to block neurotransmitter release at the synaptic cleft, what
effect would this have on muscle contraction?
It would have no effect on muscle contraction.
It would prevent muscle contraction.
It would enhance muscle contraction.
It would cause involuntary muscle contractions.
15. Describe the role of calcium ions in the process of muscle relaxation.
