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5 Written Questions

5 Matching Questions

  1. What are gated channel? There different gated channels, which channels are regulated by neurotransmitters?
  2. What is an EPSP and a IPSP? Are these graded potentials, action potentials, or can they be both?
  3. Are nerve fiber in the CNS mylelinated? Do they have a neurilemma?
  4. Define excitability. What kinds of cells possess excitability?
  5. 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?
  1. a IPSP, Inhibitory Post Synaptic Potential.
    Sensory Neurons
  2. b Yes
    Yes
  3. c Channels that are somehow opened to allow specific ions to enter and exit.
  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 Able to receive impulse from action potentials
    Contractible cells

5 Multiple Choice Questions

  1. 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
  2. Certain stimulus happens repeatedly, and adds to threshold in order to get an action potential.
    Results in threshold
  3. ...
  4. PNS
    Everywhere except the brain
  5. Cell bodies found in gray matter
    Mylenated Axons
    Because the tissue is composed of fatty tissue.

5 True/False Questions

  1. Do CNS nerve fibers generally regenerate?Not really.

          

  2. Is the resting membrane of a nerve fiber more permeable to sodium ions or to potassium ion?Active

          

  3. How are nerve impulses transmitted across synapses? Compare this to transmission of an impulse from nerve fiber to muscle fiber. Is transmission of the impulse across a synapse one-way? What role does calcium play in the release of a neurotransmitter?Through Neurotransmitters
    Yes
    Calcium has to go into the synapse to stimulate the vessels to open.

          

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

          

  5. What is neuroglia? How do these cells compare (in structure, number, and function) to the neurons. What are the functions of each of the neuroglia? Which ones are in the CNS and which ones are in the PNS?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.

          

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