Chapter 06: Contraction of Skeletal Muscle
Hall: Guyton and Hall Textbook of Medical Physiology, 13th Edition
MULTIPLE CHOICE
1. A 28-year-old man has been training as a distance runner for the past 6 years. Compared with
a sprinter, which of the following is most likely to be decreased in the skeletal muscles of
this athlete during resting conditions?
A. Capillary density
B. Glycolytic enzyme content
C. Mitochondrial volume density
D. Myoglobin content
E. Oxidative capacity
ANS: A PTS: 1
2. A physiology experiment is conducted in which a skeletal muscle twitch is initiated with an
electrical stimulator. Which factor contributes to the termination of a typical skeletal muscle
twitch?
A. Calcium uptake by sarcoplasmic reticulum
B. Closure of transverse tubules
C. Depletion of calcium stores from sarcoplasmic reticulum
D. Exhaustion of muscle adenosine triphosphate stores
E. Stimulation of dihydropyridine (DHP) receptors
ANS: A PTS: 1
NURSINGKING.COM
3. A 24-year-old medical student goes to the local gym to lift weights. She begins by
bench-pressing 100 pounds as a warm-up procedure and then gradually increases the
weight. Which of the following occurs as she adds more weight?
A. Decreased frequency of motor nerve action potentials
B. Decreased velocity of motor nerve action potentials
C. Increased frequency of motor nerve action potentials
D. Increased velocity of motor nerve action potential
E. Involvement of fewer motor units
ANS: C PTS: 1
4. A 24-year-old woman is admitted to the emergency department after an automobile
accident in which lacerations to the left wrist severed a major tendon. The severed ends of
the tendon were overlapped by 6 cm to facilitate suturing and reattachment. Which of the
following characteristics would be expected after 6 weeks compared with the preinjured
muscle? Assume that series growth of sarcomeres cannot be completed within 6 weeks.
Passive Tension Maximal Active Tension
A. Decrease Decrease
B. Decrease Increase
C. Increase Increase
D. Increase Decrease
E. No change No change
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, ANS: D PTS: 1
5. During the contraction of a skeletal muscle fiber, the actin and myosin filaments slide past
each other. Which of the following represents expected changes in the widths of I bands
and A bands during the contraction process?
I Band Width A Band Width
A.
B.
C.
D.
E.
ANS: D PTS: 1
6. When a person lifts a 25-pound weight, what type(s) of muscle contraction are involved?
A. Isometric contraction only
B. Isotonic contraction only
C. Isometric contraction followed by isotonic contraction
D. Isotonic contraction followed by isometric contraction
ANS: C PTS: 1
7. The length-tension diagram shown was obtained from a skeletal muscle with equal numbers
of red and white fibers. Supramaximal tetanic stimuli were used to initiate an isometric
contraction at each muscle length studied. The resting length was 20 cm. What is the
maximum amount of active tension this muscle is capable of generating at a preload of 100
grams? NURSINGKING.COM
A. 145 to 155 grams
B. 25 to 35 grams
C. 55 to 65 grams
D. 95 to105 grams
E. Cannot be determined
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Hall: Guyton and Hall Textbook of Medical Physiology, 13th Edition
MULTIPLE CHOICE
1. A 28-year-old man has been training as a distance runner for the past 6 years. Compared with
a sprinter, which of the following is most likely to be decreased in the skeletal muscles of
this athlete during resting conditions?
A. Capillary density
B. Glycolytic enzyme content
C. Mitochondrial volume density
D. Myoglobin content
E. Oxidative capacity
ANS: A PTS: 1
2. A physiology experiment is conducted in which a skeletal muscle twitch is initiated with an
electrical stimulator. Which factor contributes to the termination of a typical skeletal muscle
twitch?
A. Calcium uptake by sarcoplasmic reticulum
B. Closure of transverse tubules
C. Depletion of calcium stores from sarcoplasmic reticulum
D. Exhaustion of muscle adenosine triphosphate stores
E. Stimulation of dihydropyridine (DHP) receptors
ANS: A PTS: 1
NURSINGKING.COM
3. A 24-year-old medical student goes to the local gym to lift weights. She begins by
bench-pressing 100 pounds as a warm-up procedure and then gradually increases the
weight. Which of the following occurs as she adds more weight?
A. Decreased frequency of motor nerve action potentials
B. Decreased velocity of motor nerve action potentials
C. Increased frequency of motor nerve action potentials
D. Increased velocity of motor nerve action potential
E. Involvement of fewer motor units
ANS: C PTS: 1
4. A 24-year-old woman is admitted to the emergency department after an automobile
accident in which lacerations to the left wrist severed a major tendon. The severed ends of
the tendon were overlapped by 6 cm to facilitate suturing and reattachment. Which of the
following characteristics would be expected after 6 weeks compared with the preinjured
muscle? Assume that series growth of sarcomeres cannot be completed within 6 weeks.
Passive Tension Maximal Active Tension
A. Decrease Decrease
B. Decrease Increase
C. Increase Increase
D. Increase Decrease
E. No change No change
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, ANS: D PTS: 1
5. During the contraction of a skeletal muscle fiber, the actin and myosin filaments slide past
each other. Which of the following represents expected changes in the widths of I bands
and A bands during the contraction process?
I Band Width A Band Width
A.
B.
C.
D.
E.
ANS: D PTS: 1
6. When a person lifts a 25-pound weight, what type(s) of muscle contraction are involved?
A. Isometric contraction only
B. Isotonic contraction only
C. Isometric contraction followed by isotonic contraction
D. Isotonic contraction followed by isometric contraction
ANS: C PTS: 1
7. The length-tension diagram shown was obtained from a skeletal muscle with equal numbers
of red and white fibers. Supramaximal tetanic stimuli were used to initiate an isometric
contraction at each muscle length studied. The resting length was 20 cm. What is the
maximum amount of active tension this muscle is capable of generating at a preload of 100
grams? NURSINGKING.COM
A. 145 to 155 grams
B. 25 to 35 grams
C. 55 to 65 grams
D. 95 to105 grams
E. Cannot be determined
This study source was downloaded by 100000899606070 from CourseHero.com on 02-14-2026 04:07:16 GMT -06:00
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