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Muscular System AP Biology Post Quiz

9 Questions
muscular system AP biology post quiz

AP Biology Muscular System Post Quiz

Questions and Answers
  • 1. 
    Muscle cells are stimulated by neurotransmitters released from the tips of:
    • A. 

      T tubules

    • B. 

      Motor cell axons

    • C. 

      Motor cell dendrites

    • D. 

      Sensory cell dendrites

    • E. 

      Sensory cell axons

  • 2. 
    All of the following are involved in the contraction of a muscle EXCEPT:
    • A. 

      Actin

    • B. 

      CAMP

    • C. 

      Myosin

    • D. 

      Tropomyosin

    • E. 

      Troponin

  • 3. 
    When an organism dies, its muscles remain in a contracted state termed rigor mortis for a brief period of time. Which of the following most directly contributes to this phenomenon?
    • A. 

      No ATP to break bonds between the actin and myosin

    • B. 

      No oxygen supplied to muscle

    • C. 

      No energy for the synthesis of actin and myosin

    • D. 

      No ATP to move cross-bridges

    • E. 

      No calcium to bind to troponin

  • 4. 
    Which of the following does not form part of the actin filament of a muscle cell?
    • A. 

      Tropomyosin

    • B. 

      Calcium-binding site

    • C. 

      Troponin

    • D. 

      Myosin

    • E. 

      Thin filament

  • 5. 
    Which of the following is the last step leading up to muscle contraction that occurs just before a myofibril contracts
    • A. 

      Tropomyosin exposes binding sites on actin

    • B. 

      ATP binds to myosin

    • C. 

      Sarcoplasmic reticulum releases calcium ions

    • D. 

      ATP is converted to ADP and Pi

    • E. 

      Action potential travels through T-tubules

  • 6. 
    What is the role of calcium in muscle contractions?
    • A. 

      To bind with troponin, changing its shape so that the actin filament is exposed

    • B. 

      To break the cross-bridges as a cofactor in the hydrolysis of ATP

    • C. 

      To transmit the action potential across the neuromuscular junction

    • D. 

      To spread the action potential through the T tubules

    • E. 

      To reestablish the polarization of the plasma's membrane following an action potential

  • 7. 
    During muscle contraction, the ion that leaks out of the sarcoplasmic reticulum and induces myofibrils to contract is
    • A. 

      Cl-

    • B. 

      K+

    • C. 

      Mg2+

    • D. 

      Ca2+

    • E. 

      Na+

  • 8. 
    1. Tropomyosin shifts and unblocks the cross-bridge binding sites. 2. Calcium is released and binds to troponin. 3. Transverse tubules depolarize the sarcoplasmic reticulum. 4. The thin filaments are ratcheted across the thick filaments by the heads of the myosin molecules and ATP. 5. An action potential in a motor neuron causes the axon to release acetylcholine, which depolarizes the muscle cell membrane. For the events listed above, which of the following is the correct sequence for their occurrence during the excitation and contraction of a muscle cell?
    • A. 

      1, 2, 3, 4, 5

    • B. 

      2, 3, 4, 1, 5

    • C. 

      2, 1, 3, 5, 4

    • D. 

      5, 3, 2, 1, 4

    • E. 

      5, 3, 1, 2, 4

  • 9. 
    Which type of muscle is responsible for peristalsis along the digestive tract?
    • A. 

      Voluntary

    • B. 

      Smooth

    • C. 

      Skeletal

    • D. 

      Striated

    • E. 

      Cardiac