Oscilloscope traces display resting and action potentials as voltage changes over time, allowing depolarization and repolarization to be identified, linking cellular mechanisms to rapid communication in nervous systems.
Coverage 2025–2025 · Updated 15 Jul 2026
An oscilloscope trace displays voltage against time, allowing action-potential threshold, amplitude, duration and frequency to be compared.
The vertical scale reports membrane potential and the horizontal scale reports time. Repeated spikes indicate frequency; baseline shifts or noise must be distinguished from true action potentials. Reading the trace means linking each voltage change to a stage of channel opening or closing.
Read a trace in order:
If five spikes occur in 0.1 seconds, the firing frequency is 50 Hz, not an amplitude of five units.
A taller trace is not automatically a stronger stimulus; check what the axis represents.
This objective is assessed through structured response, commonly using State / Annotate.
State / Annotate
Build the answer around this relationship: An oscilloscope can show resting and action potentials.
Representative question
State the apparatus used to show the resting and action potentials.
