Study Cards A & P Exam 3

  1. Which of the following structures does not conduct an action potential?
    sarcolemma
    T-tubule
    Axolemma
    Axon
    Dendrite
    Dendrite
  2. Which structure contains ATPase?
    thin filament
    thick filament
    triad
    M-line
    Thick Filament
  3. When a nerve impulse arrives at the axon terminal of a nerve:
    the axon terminal become more permeable to calcium
    the axon terminal becomes more permeable to sodium
    the axon terminal become more permeable to potassium            
    all of the above would occur
    the axon terminal become more permeable to calcium
  4. If voltage gated potassium channels open on the sarcolemma, the skeletal muscle is undergoing:
    depolarization
    hyperpolarization
    repolarization
    repolarization
  5. Which event allows the thick filament to pull the thin filament toward the M-line of the sarcomere?
    cross bridge detachment
    cross bridge formation
    power stroke
    cocking of myosin head
    Power Stroke
  6. During which phase of a muscle twitch would an action potential be propagated down the T-tubules of a skeletal muscle?
    latent period
    period of contraction
    period of relaxation
    latent period
  7. As the frequency of action potentials down the a motor nerve increases the amount of neurotransmitter released into the synaptic cleft would:
    increase
    decrease
    be unaffected
    Increase
  8. During an event such as incomplete tenanus:
     there are brief periods in which calcium is being pumped back into the SR
    there are no periods in which calcium is being pumped back into the SR
     the motor nerve must be releasing ACh in periodic bursts
     the motor nerve must be releasing ACh constantly over a brief period of time
    answers A and C are correct
    answers A and C are correct
  9. Which pathway generates the most energy for muscle contractions?
    aerobic pathway
    anaerobic pathway
    direct phosphorylation
    aerobic pathway
  10. Which substrate results from the immediate decomposition of glucose in the presence of oxygen?
    lactic acid
    water
    pyruvic acid
    ATP
    pyruvic acid
  11. Which type of muscle has the ability to contract when it is subject to a stretch that is twice its resting length?
    skeletal muscle 
    smooth muscle      
    cardiac muscle
    smooth muscle
  12. When the postsynaptic neuron becomes more negative this event is called:
    an IPSP
    an EPSP
    a resting potential
    an action potential
    an IPSP
  13. An action potential is an all-or-none event
    true            
    false
    True
  14. Action potentials that result from very strong stimuli are_____those which result from weaker stimuli.
    greater in strength than
    smaller in strength that
    of the same strength as
    of the same strength as
  15. A somatic efferent neuron is one which?
    conducts motor impulses to skeletal muscle
    conducts sensory impulses from skeletal muscle
    conducts motor impulses to smooth or cardiac muscle or glands
    conducts sensory impulses from smooth or cardiac muscle or glands
    either B or D is correct
    conducts motor impulses to skeletal muscle
  16. How does an increase in the concentration of Na+ in the intracellular fluid affect a resting membrane potential?
    the membrane will depolarization, so AP is more likely
    the membrane will hyperpolarization, so AP is less likely
    the membrane will depolarization, so AP is more likely
  17. In an EPSP, the membrane potential of the post-synaptic neuron is_____ the resting potential.
    more negative than
    less negative than
    the same as
    less negative than
  18. With one exception, each of these is accurate regarding graded potentials.
     Identify the exception.
    short-lived
    increase in amplitude as they move away from the point of stimulation
    can occur on receptor endings
    involve a change in potential difference from resting level
    results from the opening and closing of chemically gated channels
    increase in amplitude as they move away from the point of stimulation
  19. With one exception, all of the following occur during depolarization. Which does not?
    membrane permeability to Na+ increases
    Na+ moves into the cell along a steep concentration gradient
    the outside of the cell membrane becomes increasingly positive
    the rate of sodium movement into the cell increases
    the outside of the cell membrane becomes increasingly positive
  20. Schwann cells are found in the?
    CNS only             
    PNS only             
    CNS and PNS
    PNS only
  21. The most abundant source of stored energy in a muscle is
    cellular ADP
    creatine phosphate
    cellular ATP
    creatine
    glycogen
    glycogen
  22. Which one of these muscles would possess the fewest muscle fibers per motor unit?
    Muscles of facial expression
    Trapezius
    Pectoralis major
    Muscles of facial expression
  23. With one exception, each of the following is a usual result of exercise.  Which is not?
    Increase in number of mitochondria
    Increase in the number of capillaries surrounding the muscle fibers
    Increase in the amount of stored glycogen
    All of the above typically occur as a result of exercise
    All of the above typically occur as a result of exercise
  24. Which of the following is correct?
    Tension increases during isometric contraction and the muscle shortens
    Muscle length and tension remain constant during isotonic contraction
    Myofilaments are sliding during isotonic contraction
    Myofilaments are sliding during isotonic contraction
  25. Which intracellular molecule is used to quickly generate ATP when skeletal muscle suddenly becomes very active?
    Oxygen     
    Creatine phosphate          
    Myosin      
    Troponin
    Creatine phosphate
  26. Based only on an electrical gradient, sodium ions should:
    enter the resting cell
    leave the resting cell
    not cross the resting cell membrane
    enter the resting cell
  27. A change in membrane potential from resting to a more negative voltage
    is a depolarization
    is often due to sodium entry into the cell
    leaves the membrane less responsive to stimulation
    all of the above are correct
    leaves the membrane less responsive to stimulation
  28. If a stimulus that is significantly stronger than threshold is applied to the membrane of an        excitable cell during its relative refractory period, what will likely occur?
    the membrane will not respond
    the membrane will hyperpolarize
    the membrane will depolarize
    the membrane will depolarize
  29. If the ECF concentration of sodium increased, the rate of sodium diffusion across the             membrane would:
    increase    
    decrease   
    not change
    increase
  30. Synaptic transmission at the neuromuscular junction involves the neurotransmitter _____ and results in _________.
    dopamine…excitation
    norepinephrine…hyperpolarization
    acetylcholine…hyperpolarization
    norepinephrine…depolarization
    acetylcholine…depolarization
    acetylcholine…depolarization
  31. Which of the following membrane potentials represents hyperpolarization in a typical             nerve cell?
    -70 mV     
    0 mV        
    -90 mV     
    +40 mV    
    both  A and C
    -90mV
  32. In an EPSP, the membrane potential of the post-synaptic neuron is_____ the resting       potential.
    more negative than
    less negative than 
    the same as
    less negative than
  33. Which of the following will increase the speed of nerve impulse transmission?
    salutatory conduction
    larger axon diameter
    less myelination
    all of the above
    answers A and B are correct
    answers A and B are correct
  34. Which of the following comprise the thin myofilament?
    Myosin molecules
    Actin and  myosin
    Actin, tropomyosin and troponin
    Tropomyosin and troponin
    Actin, tropomyosin and troponin
  35. Which of the following affect(s) the strength or force of skeletal muscle contraction?
    The number of muscle fibers contracting
    The degree of muscle stretch
    The relative size of the muscle
    All of the above
    All of the above
Author
Sgokey3572
ID
346242
Card Set
Study Cards A & P Exam 3
Description
A&P exam 3
Updated