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5 Written Questions

5 Matching Questions

  1. What is the role of the Schwann Cell in the formation of the myelin sheath. What is the neurilemma? What is a node of Ranvier? Are nodes of Ranvier in both the CNS and the PNS?
  2. What parts of neurons are found in gray matter? White matter? Why is it white?
  3. What is the refractory period (absolute and relative)? What are the ligand gated channels doing at this time?
  4. What is an EPSP and a IPSP? Are these graded potentials, action potentials, or can they be both?
  5. How are electrical potentials of cell membranes measured?
  1. a Absolute Refractory Period - complete insensitivity exists to another stimulus. Voltage gated Na+ Channels open and close.
    Relative Refractory Period - follows the absolute period, membrane is more permeable to K+ because many voltage gated K+ channels are open.
  2. b mV
  3. c Schwann Cell wraps around the axon to form the myelin sheath.
    Neurilemma is the plasma membrane of a neuron
    Ranvier is the space between mylination
    Yes
  4. d 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
  5. e Cell bodies found in gray matter
    Mylenated Axons
    Because the tissue is composed of fatty tissue.

5 Multiple Choice Questions

  1. 3 Na out, 2 K in
  2. Neuroglia are cells that support and protect neurons

    There are more neuroglia than neurons, they don't have dendrites or axons.

    Astrocytes (CNS) - Forms blood brain barrier, protects neurons, allow the exchange of nutrients and waste
    Oligodendricites - Mylinate the CNS
    Epidymal (CNS) - Circulate the cerebral spinal fluid
    Microglia - Eat debris in the CNS

    Satellite and Schwann Cells are in the PNS.
  3. 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
  4. To travel across the synapse and get the action potential to the next neuron
    Ach is acetylcholine
    Cholinergic synapses -
  5. Axonal transport is a cellular process responsible for movement of mitochondria, lipids, synaptic vesicles, proteins, and other cell parts (i.e. organelles) to and from a neuron's cell body, through the cytoplasm of its axon

5 True/False Questions

  1. What is an electrochemical gradient?Only allows certain things through.

          

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

          

  3. Describe the ionic basis for an action potential (depolarization). What is the ionic basis for repolarization? What is hyperpolarization? What ions are involved?Voltage Gated Na+ Channels

          

  4. If a neuron synapses on a second neuron and drives the resting membrane potential further from threshold, what is this called? Where does it occur?IPSP, Inhibitory Post Synaptic Potential.
    Sensory Neurons

          

  5. 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

          

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