It can be shown that the constant m, and r. can be written as follows, Rum 2 Ta (13) P ra = (14) Tra2 Where Am is membrane resistance per unit area, a is the radius of the dendrite, and p is the resistivity of the cytoplasm which is the inverse of conductivity o. Question 17: Redefine A in terms of a, Rm, and p using the equations above. Discuss how the dendrite radius and cytoplasm resistivity effect the potential in dendrites and ulti- mately neuron signalling