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8 Cards in this Set
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- Back
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Nervous Tissues
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Nerve-organ Epineurium
bundle-fasicicles perineurium cell-fibers=neurons endoneurium |
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Types of glial cells
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astrocyte-food to neurom
microglia-immune cell epednymal-move CSF fluin Oligodendrocyte- makes myelin in CNS Schwann Cell - makes myelin in PNS |
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What is the example of a slow wire?
Fast wire? |
Slow= digestion
Fast=optic |
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What is the threshold for that a nerve signal needs to reach?
what is resting potential |
-55 MV= trigger point
-70= resting potential |
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What are the steps to a nerve signal?
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1.Stimulus creates a graded potential
2. If threshold is reached, impulse sent down axon 3. Action potential-NA enters into the axon via voltage gated channel by diffusion 4. Increase in voltage = more NA sodium channels open 5. Sodium channels close when = O MV - slow to close making it dip 6. K+ leaves axon through K+ voltage channels by diffusion (repolarization) 7. Gates slow to close causing it to go past zero 8. reset to resting potential= pump out NA & K+ in with ATP Every 3 NA out = 2 K+ in 9.Action potential propogates down axon section by section |
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What is depolarization
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when NA enters into the axon by diffusion
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What is repolarization
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When K+ leaves the axon by diffusion
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Saltatory Propogation
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action potential jumps from node to node "doing the wave"
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