Biomed 100 Practice Quiz
Chapter 8, Spring 2007
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Multiple Choice - One Correct Choice Per Question
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    1. Cross-bridges between _?_ and _?_ are most directly responsible for muscle contractions.
      1. thin filaments and motor neurons
      2. thick filaments and thin filaments
        3.
      3. thin filaments and epiphyseal plates
      4. motor neurons and intercalated discs
      5. thick filaments and intercalated discs

    2. The strength of a muscle contraction is determined mainly by the...
      1. strength of the action potential (nerve signal) that travels through motor neurons
      2. number of motor units that are activated by action potentials (nerve signals)
        3.

    3. Intercalated discs allow _?_ to spread rapidly through _?_.
      1. ATP / voluntary muscle
      2. striations / involuntary muscle
      3. thin filaments / skeletal muscles
      4. electrical impulses / cardiac muscle
        5.
      5. sodium and calcium ions / motor neurons

    4. _?_ and _?_ may both be considered cells.
      1. origins and insertions
      2. myofibrils and sarcomeres
      3. motor neurons and muscle fibers
        4.
      4. thick filaments and thin filaments

    5. In a muscle contraction, the _?_ are pulled toward the center of each sarcomere.
      1. thick filaments
      2. thin filaments
        3.
      3. both of the above
      4. none of the above

    6. Characteristics of cardiac muscle fibers include...
      1. contractions that are normally more prolonged than those of skeletal muscle fibers
        2.
      2. the capacity to undergo mitosis at any time throughout life
      3. both of the above
      4. none of the above

    7. The most direct cause of constriction of a blood vessel is...
      1. body temperature that is rising rapidly or greatly elevated
      2. contraction of smooth muscle in the wall of the vessel
        3.
      3. contraction of skeletal muscle located outside the vessel
      4. contraction of heart muscle during each cycle of heart function
      5. relaxation of heart muscle during each cycle of heart function