BIOS 252 Final Exam Practice Test Questions And Answers Well Illustrated.
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Course
BIOS 252
Institution
BIOS 252
BIOS 252 Final Exam Practice Test Questions And Answers Well Illustrated.
Which of the following is a recognized function of skeletal muscle?
1) A) guard body entrances and exits
B) maintain posture
C) maintain body temperature
D) produce movement
E) all of the above - correc...
BIOS 252 Final Exam Practice Test
Questions And Answers Well Illustrated.
Which of the following is a recognized function of skeletal muscle?
1) A) guard body entrances and exits
B) maintain posture
C) maintain body temperature
D) produce movement
E) all of the above - correct answer. E
Nerves and blood vessels that service the muscle fibers are located in the connective
tissues of the
A) myofibrils.
B) sarcolemma.
C) endomysium.
D) sarcomere.
E) perimysium. - correct answer. E
Which of the following best describes the term sarcoplasmic reticulum?
A) largely made of myosin molecules
B) storage and release site for calcium ions
C) thin filaments are anchored here
D) protein that accounts for elasticity of resting muscle
E) repeating unit of striated myofibrils - correct answer. B
Interactions between actin and myosin filaments of the sarcomere are responsible for
A) the conduction of neural stimulation to the muscle fiber.
B) muscle fatigue.
C) the striped appearance of skeletal muscle.
D) muscle contraction.
,E) muscle relaxation. - correct answer. D
The region of the sarcomere that always contains thin filaments is the
A) Z line.
B) A band.
C) H band.
D) M line.
E) I band. - correct answer. E
At rest, active sites on the actin are blocked by
A) calcium ions.
B) troponin molecules.
C) tropomyosin molecules.
D) myosin molecules.
E) ATP molecules. - correct answer. C
Cross-bridges are portions of
A) actin molecules.
B) myosin molecules.
C) tropomyosin molecules.
D) troponin molecules.
E) calcium ions. - correct answer. B
When a skeletal muscle fiber contracts, A) the zones of overlap get larger.
B) the H bands and I bands get smaller.
C) the Z lines get closer together. D) the width of the A band remains constant.
E) all of the above - correct answer. E
The following is a list of the events that occur during a muscle contraction. 1. Myosin
cross-bridges bind to the actin.
2. The free myosin head splits ATP.
3. Calcium ion is released from the sarcoplasmic reticulum.
4. The myosin head pivots toward the center of the sarcomere.
5. Calcium ion binds to troponin. 6. The myosin head binds an ATP molecule and
detaches from the actin.
The correct sequence of these events is
A) 3, 5, 1, 2, 4, 6.
B) 1, 4, 6, 2, 3, 5.
C) 1, 3, 5, 4, 6, 2.
D) 5, 1, 4, 6, 2, 3.
E) 3, 5, 1, 4, 6, 2. - correct answer. E
Active sites on the actin become available for binding after
A) troponin binds to tropomyosin. B) calcium binds to tropomyosin. C) myosin binds to
troponin.
D) calcium binds to troponin.
, E) actin binds to troponin. - correct answer. D
In an isotonic contraction,
A) muscle tension exceeds the load and the muscle lifts the load. B) many twitches fuse
into one.
C) tension rises and falls but the muscle length is constant.
D) flexion is produced.
E) the peak tension is less than the load. - correct answer. A
During anaerobic glycolysis
A) oxygen is not consumed.
B) pyruvic acid is produced.
C) ATP is produced.
D) all of the above
E) B and C only - correct answer. D
The type of muscle fiber that is most resistant to fatigue is the ________ fiber.
A) intermediate
B) fast
C) high-density
D) anaerobic
E) slow - correct answer. E
Shortening a muscle while it maintains constant tension is called ________.
A) complete tetanus
B) an isometric contraction
C) an isotonic contraction
D) incomplete tetanus
E) an isokinetic contraction - correct answer. C
Which of the following is not a characteristic of a muscle cell?
A) Conductivity
B) Excitability
C) Contractility
D) Plasticity
E) Extensibility - correct answer. D
The most common lever systems in the body are those that have the applied force
between the fulcrum and the load. These are called ________ levers.
A) fourth-class
B) second-class
C) fifth-class
D) third-class
E) first-class - correct answer. D
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