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13 Cards in this Set
- Front
- Back
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2 reasons why sodium movement predominates potassium.
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1. Sodium channels open faster.
2. Higher Na+ driving force.` |
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5 components of sodium channel voltage gates.
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1. Activation gate
2. Inactivation gate 3. Conductance pore 4. Selectivity filter 5. Voltage sensor |
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Calcium's effect on voltage gated channels.
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increases threshold and stabilizes membrane
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Tetradotoxin's effect on voltage gated channels.
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blocks sodium channels on extracellular side
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Local anesthesia's effect on voltage gated channels.
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insert in conductance pore and block sodium perm. increase
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Batrachtotoxin's effect on voltage gated channels.
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irreversibly opens sodium channels
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Scorpion Toxin's effect on voltage gated channels.
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blocks opening of Potassium channels
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TEA's effect on voltage gated channels.
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blocks voltage gated K+ channels from intracellular side
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What direction is antidromic?
Orthodromic? |
Antidromic= toward cell body
Orthodromic= toward axon terminal |
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2 ways to increase conduction velocity along axon.
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1. Increase diameter of axon
2. Reduce short-circuiting across membrane (myelination) |
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Name for myelination in PNS and CNS.
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PNS- schwann cells
CNS- oligodendrocytes |
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Name for break between glial cells (myelination)
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Nodes of Ranvier
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What type of conduction is involved in myelinated cells?
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Saltatory conduction
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