Vertebrate A&P I: Lecture Exam #3
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Questions and Answers

Which of the following is a characteristic of striated (skeletal) muscle tissue?

  • Is present in the walls of arteries
  • Has the ability to contract when stimulated
  • Composed of long, spindle-like cells, each containing a single nucleus (correct)
  • Has the ability to contract rhythmically by itself

    • Which statement about muscle tissue is true?

  • Skeletal muscle fibers lack voluntary control
  • Skeletal muscle fibers are under voluntary control (correct)
  • Striated muscles are those without antagonists
  • Most of the muscle tissue of the body is smooth (nonstriated) muscle

    • If a tissue has striations and several flattened peripheral nuclei per fiber, then that tissue could be

  • Skeletal muscle
  • Smooth muscle
  • Cardiac muscle (correct)
  • Visceral muscle

    • Cylindrical muscle cells that contain multiple nuclei located peripherally within the cell would be

    <p>Skeletal muscle cells only</p> Signup and view all the answers

    The ability of a muscle to stretch without being damaged is known as

    <p>Extensibility</p> Signup and view all the answers

    What is a tendon composed of?

    <p>Epimysium</p> Signup and view all the answers

    The sarcolemma is responsible for

    <p><strong>Regulating the passage of substances into and out of the muscle fiber</strong></p> Signup and view all the answers

    What is the role of acetylcholine (ACh) in skeletal muscle contractions?

    <p>Bind to specific receptors on the sarcolemma to open sodium ion channels.</p> Signup and view all the answers

    What happens during the latent period of a muscle contraction?

    <p>Calcium ions are beginning to enter the sarcoplasm from the sarcoplasmic reticulum.</p> Signup and view all the answers

    What is the function of myoglobin?

    <p>Bind oxygen for aerobic respiration.</p> Signup and view all the answers

    Why are skeletal muscle fibers multinucleate?

    <p>The fibers formed from the fusion of many smaller cells during embryonic development.</p> Signup and view all the answers

    Where is myosin seen?

    <p>Thick filaments.</p> Signup and view all the answers

    How is glucose stored in muscle cells?

    <p>Glycogen.</p> Signup and view all the answers

    What structures meet at the neuromuscular junction?

    <p>An axon and the sarcolemma.</p> Signup and view all the answers

    What is the Sliding Filament Theory of muscle contraction?

    <p>Thin filaments are pulled toward the center of the sarcomere by swiveling of the myosin heads.</p> Signup and view all the answers

    What is fused tetanus in terms of muscle contraction?

    <p>A sustained contraction in which individual twitches cannot be discerned.</p> Signup and view all the answers

    What is a motor unit?

    <p>A motor neuron plus all the skeletal muscle fibers it stimulates.</p> Signup and view all the answers

    What is the refractory period in muscle physiology?

    <p>Following a stimulus during which a muscle cell cannot respond to another stimulus.</p> Signup and view all the answers

    What is the gap between a motor neuron and a muscle cell called?

    <p>Synaptic cleft</p> Signup and view all the answers

    What is the inability of a muscle to contract forcefully after prolonged activity called?

    <p>Muscle fatigue</p> Signup and view all the answers

    What is the oxygen-binding protein in skeletal muscle cells?

    <p>Myoglobin</p> Signup and view all the answers

    What is the region of a sarcolemma adjacent to the axon terminals at a neuromuscular junction called?

    <p>Motor end plate</p> Signup and view all the answers

    What structures in smooth muscle fibers are functionally analogous to the Z discs of skeletal muscle fibers?

    <p>Dense bodies</p> Signup and view all the answers

    What is the time between the application of a stimulus and the beginning of contraction called?

    <p>Latent period</p> Signup and view all the answers

    What is the time following a stimulus during which a muscle cell is unable to respond to another stimulus called?

    <p>Refractory period</p> Signup and view all the answers

    What does involuntary inactivation of a small number of motor units cause, giving relaxed skeletal muscle a firmness?

    <p>Muscle tone</p> Signup and view all the answers

    Which type of muscle tissue includes both A and B?

    <p>Both A and B</p> Signup and view all the answers

    Which one of these structures is functionally analogous to Z discs in smooth muscle fibers?

    <p>Dense bodies</p> Signup and view all the answers

    The inability of a muscle to contract forcefully after prolonged activity is called _____.

    <p>Muscle fatigue</p> Signup and view all the answers

    The time between the application of a stimulus and the beginning of contraction, when calcium ions are being released from the sarcoplasmic reticulum, is called the _____ period.

    <p>Latent period</p> Signup and view all the answers

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