Biomed 100 Practice Quiz
Chapter 8, Spring 2008
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  1. Which of the following is true?
    1. Skeletal muscle fibers are relatively small cells.
    2. Skeletal muscle fibers contain many nuclei and mitochondria.
      3.
    3. Ligaments connect muscle to bone.
    4. Skeletal and cardiac muscle cells are capable of mitosis (cell division) throughout life.

  2. Which one of the following contributes most to the striated appearance of skeletal muscle fibers?
    1. presence of many nuclei within the fiber
    2. presence of many mitochondria within the fiber
    3. presence of many motor neurons within the fiber
    4. presence of many intercalated discs within the fiber
    5. presence of alternating A bands and I bands within the fiber
      6.

  3. When speaking of skeletal muscle, the "cross bridges"
    1. link the conscious part of the brain to the spinal cord
    2. link the spinal cord to the appropriate motor neurons
    3. link the motor neurons to the muscle fibers
    4. link the thick filaments to the thin filaments
      5.
    5. link the Z lines to the motor units

  4. One "motor unit" includes
    1. all of the muscle fibers in one muscle
    2. all of the myofibrils in one muscle fiber
    3. all of the sarcomeres in one myofibril
    4. all of the thick and thin filaments in one sarcomere
    5. all of the muscle fibers connected to one motor neuron
      6.

  5. In myofibrils, the thin filaments do not
    1. resemble two strings of beads or pearls twisted around each other
    2. attach to the Z lines
    3. have "heads" that can pivot forcibly after attaching to actin molecules
      4.
    4. slide toward the center of the sarcomere during contraction

  6. The spinal cord contains the _?_ of many motor neurons.
    1. axons
    2. cell bodies
      3.
    3. axon terminals (distal ends)
    4. sodium gates
    5. potassium gates

  7. Which one of the following is false?
    1. The sliding filament theory states that when a muscle changes in length, the thick and thin filaments slide past each other.
    2. It is consistent with the sliding filament theory that the degree of overlap between thick and thin filaments is affected by the length of the muscle.
    3. It is consistent with the sliding filament theory that the strength of a muscle is affected by its length.
    4. The sliding filament theory is important because the thin filaments have never been seen, even with the most powerful of microscopes.