Identify the neuronal circuits described by choosing the correct response from the key.Key:a) convergingb) divergingc) parallel after-discharged) reverberating_____ 1) Impulses continue around and around the circuit until one neuron stops firing._____ 2) One or a few inputs ultimately influence large numbers of neurons._____ 3) Many neurons influence a few neurons._____ 4) May be involved in exacting types of mental activity
  • chiefly a potassium current
  • acetylcholine
  • 1, d; 2, b; 3, a; 4, c
  • 1, d; 2, b; 3, f; 4, c; 5, a
Match the names of the supporting cells with the appropriate descriptions.Key:a) astrocyteb) ependymal cellc) microglial celld) oligodendrocytee) satellite cellf) Schwann cell_____ 1) myelinates nerve fibers in the CNS_____ 2) lines brain cavities_____ 3) myelinates nerve fibers in the PNS_____ 4) CNS phagocyte_____ 5) helps regulate the ionic composition of CNS extracellular fluid
  • chiefly a potassium current
  • it hyperpolarizes the postsynaptic membrane
  • 1, d; 2, b; 3, a; 4, c
  • 1, d; 2, b; 3, f; 4, c; 5, a
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