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16 Cards in this Set
- Front
- Back
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What is the fxn of astrocytes?
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helps form blood brain barrier
metabolism of NTs helps in brain development |
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What is the fxn of oligodendrocytes?
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supports neurons and produces myelin sheath around axons
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What is the fxn of microglia?
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involved in active immune defense
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Where are astrocytes found?
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brain and spinal cord
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Where are microglia found?
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CNS
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Where are oligodendrocytes found?
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CNS
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Where are ependymal cells found?
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brain
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What is the fxn of ependymal cells?
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cover choriod plexus
produce CSF |
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What part of the neuron triggers axn potentials?
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axon
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What part of the neuron conducts action potentials?
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axon
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What cells form the myelin sheath in the PNS?
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schwann cells
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What cells form the myelin sheath in the CNS?
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oligodendrocytes
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Why do nodes of Ranvier exist?
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prevents nerve impulse from dying out
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Special mode of action potential propagation that occurs along myelinated axons, occurs bc of the uneven distribution of voltage-gated channels
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Saltatory Conduction
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How do graded potentials occur?
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When a stimulus causes mechanically gated or ligand-gated channels to open or close in an excitable cell's plasma membrane
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How do axn potentials occur?
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When depolarization reaches a certain level termed the threshold
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