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Essentials of Anatomy and Physiology
6th Edition
Chapter 7
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Question 1
______ surrounds each muscle fasciculus, whereas ______
surrounds each muscle fiber.
A. Epimysium, perimysium
B. Perimysium, endomysium
C. Epimysium, endomysium
D. Endomysium, perimysium
E. Endomysium, epimysium
Question 2
The basic structural and functional unit of skeletal muscle
is the
A. fiber.
B. fasciculus.
C. myofibril.
D. sarcomere.
E. whole muscle.
Question 3
Which of these units contains overlapping actin and
myosin myofilaments?
A. A band
B. H zone
C. I band
D. M line
E. Z disk
Question 4
Which of these is NOT a part of the actin myofilament?
A. actin
B. sarcolemma
C. tropomyosin
D. troponin
Question 5
Each muscle cell is a
A. fasciculus.
B. sarcomere.
C. fiber.
D. myofibril.
E. myofilament.
Question 6
To establish the resting membrane potential,
A. sodium ions diffuse into the cell.
B. sodium ions diffuse out of the cell.
C. potassium ions diffuse into the cell.
D. potassium ions diffuse out of the cell.
E. large negative molecules diffuse out of the cell.
Question 7
Before being released from the axon of a neuron,
acetylcholine is stored in the
A. synaptic vesicles.
B. synaptic cleft.
C. muscle fiber.
D. postsynaptic membrane.
E. sarcoplasmic reticulum.
Question 8
During the process of muscle contraction, calcium ions
bind to the
A. presynaptic terminal.
B. sarcolemma.
C. synaptic vesicles.
D. tropomyosin molecules.
E. troponin molecules.
Question 9
During muscle contraction, which of these processes
requires ATP?
A. Calcium ions are moved back to the sarcoplasmic
reticulum.
B. Cross-bridges are released.
C. Heads of the myosin myofilaments are bent toward the
center of the sarcomere.
D. Heat is released.
E. All of these.
Question 10
Even though each muscle fiber responds in all-or-none
fashion, a whole muscle can contract with varying force
because of
A. different threshold values.
B. total tetanus of the muscle.
C. recruitment of additional motor units.
D. rigor mortis.
E. the lag phase of contraction.
Question 11
Anaerobic respiration
A. produces 36-38 ATP per glucose molecule.
B. produces an oxygen debt.
C. occurs in resting muscles or muscles undergoing longterm exercise.
D. can use fatty acid to produce ATP.
E. All of these.
Question 12
Fast-twitch muscle fibers
A. are more resistant to fatigue than slow-twitch fibers.
B. have a richer blood supply than slow-twitch fibers.
C. have a larger amount of stored glycogen than slowtwitch fibers.
D. have more mitochondria than slow-twitch fibers.
E. have more myoglobin than slow-twitch fibers.
Question 13
Two muscles that are antagonists are the
A. rectus femoris and vastus lateralis.
B. vastus medialis and vastus intermedius.
C. adductor longus and vastus lateralis.
D. rectus femoris and semimembranosus.
E. gluteus maximus and semitendinosus.
Question 14
If a woman raised her arms straight out pointing right
and left, level with her shoulders, she mostly used her
A. biceps brachii muscles.
B. latissimus dorsi muscles.
C. pectoralis major muscles.
D. deltoid muscles.
E. All of these.
Question 15
Which of these muscles flexes both the arm and the
forearm?
A. biceps brachii
B. brachialis
C. deltoid
D. latissimus dorsi
E. triceps brachii
Question 16
All of the following are functions of the muscular system
EXCEPT:
A. Maintenance of posture
B. Production of body heat
C. Communication
D. Storage of mineral and fat
E. Constriction of organs and vessels
Question 17
Which of the following is not a functional characteristic of
skeletal muscle?
A. Contractility
B. Excitability
C. Extensibility
D. Elasticity
E. All of these are characteristics of skeletal muscle.
Question 18
As the action potential arrives at a presynaptic terminal,
the event that causes the release of acetylcholine from
synaptic vesicles into the synaptic cleft is
A. Ca++ ions entering the presynaptic terminal.
B. Na+ ions entering the presynaptic terminal.
C. Ca++ ions entering the postsynaptic cell.
D. Na+ ions entering the postsynaptic cell.
E. Ca++ ions exiting the presynaptic terminal.
Question 19
The rotator cuff consists of all of these muscles EXCEPT:
A. teres major.
B. teres minor.
C. subscapularis.
D. supraspinatus.
E. infraspinatus.
Question 20
In _________ contractions the amount of tension increases
during the contraction process, but the length of the
muscle does not change.
A. isotonic
B. isometric
C. concentric
D. eccentric
Answer Key
1. B
2. D
3. A
4. B
5. C
6. D
7. A
8. E
9. E
10. C
11. B
12. C
13. D
14. D
15. A
16. D
17. E
18. A
19. A
20. B