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Lecture16-2009W - Speed of Propagation(1 Greater length...

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Speed of Propagation: (1) Greater length constant ( λ ) (2) Temp (3) # of channels ν = Δ d / Δ t ( m/s) If Δ d = 3cm, Δ t = 1ms ν = 3x10 -2 m /10 -3 s = 30m/s (1) Greater length constant ( λ ) (2) Temp: homeotherm vs poikilotherm (3) # of channels λ λ = R m R l R m 1/As ( As = 2 π rl ) R l 1/Ax (Ax = π r 2 ) Increase axon φ Node of Ranvier Within a Neuron Sensory Motor Transmission of Information between Neurons Type of Synapses (1) Electrical synapses by direct ionic coupling (2) Chemical synapses with neurotransmitters
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