Imagine that you have extracted an unmyelinated neuron and have placed it in a sterile petri dish filled with a solution mimicking its natural extracellular envirnoment. you artificially stimulate this neuron by adding excitatory neurotransmitters to the solution.

Using three microelectrodes, you probe the axon at three points. you simultaneously monotor the membrance potential at these three points. you simultaneously monitor the membrance potential at these three points. two of the recordings are given in the first two boxes that follow. In the third box, determine what the middle electrode recording should look like. create a sketch of what you think the action potential in the middle looks like?

what the Recording from this position +30- 5 +20. Membrane potential (mv) E +10- 0- -10- -20 -30- -50- -60- -70- -80- T 23 4 Time (msec) - Axon terminals ** Recording from this position Membrane potential (mv) +30- +20- E +10 01 -10- -20 -30- -40- -50- -60- -70- -80- 1234 Time (msec) Cell body