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Lecture15-2009W - Δ I R l R m Δ V x = Δ V 0 • e-x ...

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Transmission of Information within a Single Neuron Action potentials Ionic currents Ion channels Falling phase Rising phase Passive spread vs. Active propagation Morphological feature barb2left long & thin processes Cable properties of axons barb2left decays with distance (1) cytoplasmic R to electrical signals (2) leaking through plasma memb. Transmission of Information within a Single Neuron
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Passive Spread of Electrical Signals barb2right Why does a current flowing decay with distance?
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Unformatted text preview: Δ I R l R m Δ V x = Δ V 0 • e (-x/ λ) λ) λ = length constant If Δ I travels λ ( x =λ) , Δ V decreases ~63% Also , λ = R m R l Q) If axon A = φ 0.1mm, axon B = φ 5mm, which has greater λ ? 0.37V Propagation of a Nerve Impulse (AP) (1) Local circuits – AP propagation (2) Unidirectional - Electrical excitability of Na + Channels...
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