A&P Exam 3 Practice

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  1. Which of the following muscle types is under conscious control?
  2. What is the contractile unit of skeletal muscles?
    sarcomere (or myofibrils)
  3. Which of the following is incorrect regarding the muscular functions?
    interpretation of sensory input
  4. The thin filaments are not comprised of which of the following components?
    myosin (or titin)
  5. Based on the sliding filament theory, which of the following is apparent during muscle contraction?
    The Z discs move closer together.
  6. At the neuromuscular junction, the muscle contraction initiation event is ______.
    binding of acetylcholine to membrane receptors on the sarcolemma
  7. During repolarization, the sarcolemma is most permeable to _______.
    potassium ions
  8. The major function of the T tubules in muscle contraction is to ________.
    conduct electrical impulses that simulate calcium release from the sarcoplasmic reticulum
  9. What is the role of calcium ions in skeletal muscle contraction?
    bind to troponin to activate cross bridge formation
  10. What would be the response of the muscle treated with an acetylcholinesterase inhibitor?
    There would be continued muscle contraction in the absence of additional nervous stimulation.
  11. Corpses usually exhibit rigor mortis because __________.
    a lack of ATP prevents myosin head detachment from actin
  12. Fine movements in the eyes and fingers are controlled by ______ motor units.
  13. Isometric contractions occur when an individual is ________.
    holding a heavy object above the ground
  14. Skeletal muscle contractions increase in strength due to the followings except:
    increasing the number of new muscle fibers
  15. Which of the following is incorrect regarding muscle tone?
    It is maintained by tendon reflex.
  16. The oxygen-binding protein found in a muscle fiber is ___________.
  17. A marathon runner would likely have more __________ muscle fibers.
    slow oxidative
  18. Which activity would be most dependent upon creatine phosphate?
    weight lifting
  19. All of the following can occur during exercise except:
    inorganic phosphate levels decrease.
  20. Which of the following is not a usual result of exercise?
    increase in the number of muscle cells
  21. Which of the following is not the neurotransmitter of smooth muscle?
  22. The mechanism of contraction in smooth muscle is different from skeletal muscle in that ________.
    The calcium binding protein is calmodulin in smooth muscle and troponin in skeletal muscle.
  23. A major feature in smooth muscle that contributes to its rhythmicity and ability to participate in peristalsis is the presence of _________.
    gap junctions
  24. Which unique characteristic of smooth muscle allows your stomach to stretch as you eat and not contract immediately to expel food?
    stress-relaxation response
  25. Which muscle cells have the greatest ability to regenerate?
  26. While studying for an exam, you reach for coffee. Which nervous system is activated when you extend your arm?
  27. Which of the neuroglia plays an active role in moving the cerebrospinal fluid?
    ependymal cells
  28. Schwann cells are functionally similar to ________.
  29. Which part of a neuron can make synapses with other neurons?
    • all of the above
    • axon
    • dendrite
    • cell body
  30. The basis for differentiation between gray matter and white matter in the CNS is the presence of_______ in white matter.
    myelinated fibers
  31. Which of the following is incorrect?
    Bipolar neurons are most abundant.
  32. Which of the following is not a special characteristic of neurons?
    They are mitotic.
  33. The interior surface of a cell membrane of a resting neuron differs from the external environment in a way that the interior is ________.
    negatively charged and contains more potassium whereas the exterior contains more sodium
  34. Maintenance of the resting membrane potential is possible due to:
    • both a and b
    • a. ATP expenditure of the neuron.
    • b. the actions of the sodium-potassium pump.
  35. Which ion channels open in response to a change in membrane potential and participate in the generation and conduction of action potentials?
    voltage-gated channels
  36. Action potentials are propagated uni-directionally toward axon terminals because:
    membranes become nonresponsive due to inactive sodium channels after action potential generation.
  37. The point at which the all-or-none principle of action potential generation is reached is termed
    the threshold
  38. Saltatory conduction is made possible by ________.
    myelin sheath
  39. All of the following statements are true regarding action potentials except:
    Stronger stimuli generate higher amplitude of action potential.
  40. The presynaptic neuron releases neurotransmitters in response to an influx of _______ ions.
  41. Which of the following is not a chemical class of neurotransmitters?
    nucleic acid
  42. Which of the following is the neurotransmitter typically associated with drug addiction?
  43. Prozac used for the treatment of depression exerts its effects by keeping the concentration of serotonin elevated in the synapse. These drugs exert their effects by:
    all of the above
  44. Which of the following is not true regarding graded potentials?
    They are generated by voltage-gated channels.
  45. An inhibitory postsynaptic potential (IPSP) is associated with ________.
  46. __________ occurs when a neuron is stimulated at more than one dendrite.
    Spatial summation
  47. Generation of an action potential can be inhibited by all of the following except:
  48. The natural opiate of our body is ________.
  49. Which of the following is incorrect regarding G-protein linked receptors?
    They are ligand-gated ion channels and their effects are brief
  50. Which of the following does not bind to calcium to regulate muscle or neuronal activity?
  51. Which of the following neuroglia regulates capillary permeability in the blood brain barrier?
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A&P Exam 3 Practice
2014-04-14 09:57:01
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