Do NOT answer #8. Give a detailed explanation for #9. Question #8 is only shown for reference.

& Describe what you observed in reference to oscilloscope tracings whet: (a) a single stimulus was applied to the axon via the stimulator at the initial setting of 20 mV; (b) twin pulses were applied at the initial setting of 20 mV and an interval of 250 msee. (e) Explain why these observations were possible (3 points) 9. Subsequent to the initial settings discussed in questions, dual pulses were then applied to the axon with stimulator settings fixed at: Interval Between Stimuli Stimulus Voltage (mesec) (msec) Duration (MV) 60 0.5 With these experimental conditions it was found that only one action potential could be observed on the oscilloscope. Discuss: (a) the mechanisms) responsible for this observation at the level of axonal membrane; and (b) how and why a second action potential could in fact be generated at this time interval (4 points) & Describe what you observed in reference to oscilloscope tracings whet: (a) a single stimulus was applied to the axon via the stimulator at the initial setting of 20 mV; (b) twin pulses were applied at the initial setting of 20 mV and an interval of 250 msee. (e) Explain why these observations were possible (3 points) 9. Subsequent to the initial settings discussed in questions, dual pulses were then applied to the axon with stimulator settings fixed at: Interval Between Stimuli Stimulus Voltage (mesec) (msec) Duration (MV) 60 0.5 With these experimental conditions it was found that only one action potential could be observed on the oscilloscope. Discuss: (a) the mechanisms) responsible for this observation at the level of axonal membrane; and (b) how and why a second action potential could in fact be generated at this time interval (4 points)