Your roommate gives you a neuron dissected from a new species of tree shrew, and you decide to study action potential propagation by depolarizing one node of ranvier to +45 mV. You then measure the membrane potential at the next node of Ranvier and find that it is -25 mV (resting membrane potential is -75 mV) You determine that the 2 nodes are 0.78mm apart and the diameter of the axon is 9 micrometers. You also calculate the membrane resistance to be 7.2 Ohm mm and internal resistance to be 90 ohm/cm.
Determine the length constant based on voltage attenuation and another way. (Two different methods)
Also, if threshold for AP propagation in this axon is -60 mV, what is the maximum distance of this next node of ranvier?