BMS100 Past Test Questions
Chapter 8, Spring 2009
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  1. A property of skeletal muscle tissue that is not applicable to any other type of muscle tissue is
    1. elongated cells known as "fibers"
    2. ability to contract
    3. presence of protein filaments (thick and thin) that "grab" each other and pull to generate force
    4. voluntary control

  2. What is the function of a motor neuron?
    1. carry nerve action potential from central nervous system to muscle
    2. carry muscle action potential into muscle fiber interior
    3. "grab" thin filament and "pull" to generate force of contraction
    4. send feedback from muscle to central nervous system

  3. When the elbow is at a 90o angle, the thick and thin filaments in the upper arm muscles are
    1. completely overlapping
    2. partially overlapping
    3. not overlapping at all

  4. In muscle, the thin filaments
    1. are composed of actin molecules, each of which has a roughly spherical structure
    2. resemble two strands of pearls or beads twisted around each other
    3. are not part of the pattern of "striations"
    4. both A. and B.
    5. both B. and C.

  5. What actually becomes shorter when a muscle contracts?
    1. thick filaments
    2. thin filaments
    3. both of the above
    4. none of the above

  6. Which statement does not apply to voluntary muscle?
    1. contains cells (fibers) that possess the properties of contractility and excitability
    2. contains fibers that are branched and interconnected so that electrical signals can easily pass through the tissue
    3. is usually attached to bones
    4. is controlled by a nerve pathway that originates in the conscious part of the brain

  7. Which one of the following is false?
    1. By definition, one motor unit contains one motor neuron and one muscle fiber.
    2. The muscles of pulmonary ventilation (breathing) are skeletal muscles.
    3. The main source of body heat is from the contraction of skeletal muscles.

  8. What happens when a "head" of a myosin (thick filament molecule) forms a cross-bridge with an actin molecule in a thin filament?
    1. the head pivots and pulls on the thin filament
    2. a nerve action potential is generated and sent into the motor neuron
    3. a muscle action potential is generated and sent into the thin filament
    4. a muscle action potential is generated and sent into the thick filament

  9. In a large muscle, how is the force of contraction regulated?
    1. motor neurons produce action potentials of different voltages
    2. muscle fibers produce action potentials of different voltages
    3. within the muscle, different numbers of motor units are activated
    4. within the muscle fiber, different numbers of crossbridges between thick and thin filaments are utilized

  10. Smooth muscle tissue is not abundant in
    1. the walls of the heart
    2. the walls of blood vessels
    3. the walls of digestive organs
    4. the iris (colored part) of the eye

  11. Cells that retain the capacity for mitosis throughout a person's life include
    1. neurons of the peripheral nervous system
    2. cardiac muscle fibers
    3. both of the above
    4. none of the above

  12. Skeletal muscle fibers contain all of the following except
    1. nuclei
    2. mitochondria
    3. intercalated discs
    4. myofibrils