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5 Written questions

5 Matching questions

  1. What advantage does having a myelin sheath give to a nerve fiber?
  2. What is an EPSP and a IPSP? Are these graded potentials, action potentials, or can they be both?
  3. Define excitability. What kinds of cells possess excitability?
  4. Do CNS nerve fibers generally regenerate?
  5. Describe two conditions that allow maintenance of the resting membrane potential. How are concentration gradients involved?
  1. a Not really.
  2. b Means that action potential doesn't have to travel down the entire axon, just jumps from node to node.
  3. c EPSP - Excitatory Post Synaptic Potential; potential of the cell to reach threshold again after it has been through a cycle.
    IPSP - Inhibitory Post Synaptic Potential; Hyperpolarize on purpose to prevent a response to every stimulus.
    Both
  4. d Able to receive impulse from action potentials
    Contractible cells
  5. e The fact that the cell membrane is relatively negative and they are charged ions inside and outside the cell.

    Concentration gradients involved because K+ ions are inside, Na+ ions are outside. Keep polarity of cell in check.

5 Multiple choice questions

  1. In order to get back to polarization, they have to pump in 3 Na out, 2 K in
  2. Yes
    Yes
  3. Depolarization - Potential difference becomes smaller or less polar. If extracellular concentration of K+ increases, there is less gradient between inside and outside.
    Hyperpolarization - Potential difference becomes greater or more polar. If extracellular concentration of K+ decreases, steeper gradient between inside and outside
  4. In CNS, it doesn't heal.
    In PNS, if mylineation cells are still in tact, they will reform a path for the neuron to grow.
    Schwann Cells or Oligodendricites
  5. IPSP, Inhibitory Post Synaptic Potential.
    Sensory Neurons

5 True/False questions

  1. Is the sodium-potassium pump and active or passive process?Unipolar
    Bipolar
    Multipolar

          

  2. What are gated channel? There different gated channels, which channels are regulated by neurotransmitters?Mylination

          

  3. Axons are classified into 3 groups according to the relationship between diameter, myelination and propagation speed: define Type A, B and C fibers.Type A - large-diameter, myelinated. Conduct at 15-120 m/s. Motor neurons supplying skeletal and most sensory neurons
    Type B - medium-diameter, lightly myelinated. Conduct at 3-15 m/s. Part of ANS
    Type C - small-diameter, unmyelinated. Conduct at 2 m/s or less. Part of ANS

          

  4. What gives peripheral nerves their white appearance?Only allows certain things through.

          

  5. What is salutatory conduction of an action potential? Does it occur in all nerve fibers? How does diameter of a nerve fiber affect speed of conduction?...