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5 Written questions

5 Matching questions

  1. Define excitability. What kinds of cells possess excitability?
  2. Axons are classified into 3 groups according to the relationship between diameter, myelination and propagation speed: define Type A, B and C fibers.
  3. What is a presynaptic neuron? Postsynaptic neuron? Define converge, divergence of neurons.
  4. You may recall that a muscle fiber is an entire muscle cell; is a nerve fiber an entire neuron? (explain)
  5. What parts of neurons are found in gray matter? White matter? Why is it white?
  1. a Presynaptic - The neuron that sends the action potential to the next dendrite
    Postsynaptic - Receives the message
    Convergence of Neurons - First one neuron is influenced by many others, resulting in a convergence of input.
    Divergence of Neurons - When the neuron fires, the signal is sent to many other neurons, resulting in a divergence of output.
  2. b No because the neuron consists of many other things that make up the neuron (dendrites, axons, cell bodies, axon terminals)
  3. c Able to receive impulse from action potentials
    Contractible cells
  4. d Cell bodies found in gray matter
    Mylenated Axons
    Because the tissue is composed of fatty tissue.
  5. e 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

5 Multiple choice questions

  1. Schwann cells can point the neuron in the right direction so it can regrow to the proper receptor sites.
  2. spatial variation of both electrical potential and chemical concentration across a membrane.
  3. 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
  4. ...
  5. 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.

5 True/False questions

  1. How are electrical potentials of cell membranes measured?mV


  2. Are nerve fiber in the CNS mylelinated? Do they have a neurilemma?Not really.


  3. Describe the structure of a typical neuron. Identify as to structure and function: a cell body; dendrite; axon; microtubules; Nissl bodies; axon hillock.Unipolar


  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?Salutatory conduction of an action potential is when you jump from node to node.