Chapter 10 Quiz: Muscle Tissue
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15 Terms
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The narrow space between the synaptic terminal and the muscle fiber is the
synaptic cleft
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A weight-lifter strains to lift a heavy weight and there is no movement of the person's arms holding on to the weight. This type of contraction is called a(n) ________ contraction.
isometric
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Interactions between actin and myosin filaments of the sarcomere are responsible for
muscle contraction
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After heavy exercise, if energy reserves in a muscle are depleted, ________ occurs.
an oxygen debt
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A single motor neuron together with all the muscle fibers it innervates is called a(n)
motor unit
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A fascicle is a
group of muscle fibers that are encased in the perimysium.
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Each skeletal muscle fiber is controlled by a motor neuron at a single
neuromuscular junction.
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The plasma membrane of a skeletal muscle fiber is called the
sarcolemma
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Which of the following is a recognized function of skeletal muscle?
maintain posture
produce movement
guard body entrances and exits
maintain body temperature
produce movement
guard body entrances and exits
maintain body temperature
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The type of muscle fiber that is most resistant to fatigue is the ________ fiber.
slow
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Put the following structures in order from superficial to deep.
1.muscle fiber
2.perimysium
3.myofibril
4.fascicle
5.endomysium
6.epimysium
1.muscle fiber
2.perimysium
3.myofibril
4.fascicle
5.endomysium
6.epimysium
6, 2, 4, 5, 1, 3
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The following is a list of the events that occur during a muscle contraction. What is the correct sequence of these events?
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.
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.
3, 5, 1, 4, 6, 2
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When a muscle is stimulated repeatedly at a high rate, the amount of tension gradually increases to a steady maximum tension. This state of maximum tension is called
complete tetanus.
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If a second stimulus arrives before the relaxation phase has ended, a second, more powerful contraction occurs. This addition of one twitch to another is called
wave summation
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Cross-bridges are portions of
myosin molecules