IB Biology Topic C2.2.10 Oscilloscope Traces Showing Resting Potentials and Action Potentials Revision Notes (HL)

IB Biology Topic C2.2.10 Oscilloscope Traces Showing Resting Potentials and Action Potentials Revision Notes (HL) | RevisionDojo

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An Oscilloscope Trace Plots Membrane Potential Against Time

Definition

Oscilloscope

A device that measures and displays electrical signals, allowing the visualization of changes in membrane potential over time.

An oscilloscope turns a neuron's electrical activity into a visible trace you can read.
The trace lets you identify the resting potential and each stage of an action potential.

Note

The y-axis shows membrane potential in millivolts and the x-axis shows time in milliseconds.

A Flat Line at −70 mV Shows the Resting Potential

When the neuron is at rest, the trace holds a flat line at about −70 mV.
This steady baseline is the resting potential, the neuron's stable state before it is stimulated.

The Action Potential Appears as a Sharp Spike and Return

A stimulus that reaches the threshold of about −50 mV triggers the spike.
The trace rises steeply as the membrane depolarizes from −70 mV to a peak of about +30 mV.

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An Oscilloscope Trace Plots Membrane Potential Against Time

Definition

Oscilloscope

A device that measures and displays electrical signals, allowing the visualization of changes in membrane potential over time.

An oscilloscope turns a neuron's electrical activity into a visible trace you can read.
The trace lets you identify the resting potential and each stage of an action potential.

Note

The y-axis shows membrane potential in millivolts and the x-axis shows time in milliseconds.

A Flat Line at −70 mV Shows the Resting Potential

When the neuron is at rest, the trace holds a flat line at about −70 mV.
This steady baseline is the resting potential, the neuron's stable state before it is stimulated.

The Action Potential Appears as a Sharp Spike and Return

A stimulus that reaches the threshold of about −50 mV triggers the spike.
The trace rises steeply as the membrane depolarizes from −70 mV to a peak of about +30 mV.

Definition

Paywall

(on a website) an arrangement whereby access is restricted to users who have paid to subscribe to the site.

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Note

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Excepteur sint occaecat cupidatat non proident

Tip

Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum.

A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics

IB Biology Topic C2.2.10: Oscilloscope Traces Showing Resting Potentials and Action Potentials Notes

A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics

An Oscilloscope Trace Plots Membrane Potential Against Time

A Flat Line at −70 mV Shows the Resting Potential

The Action Potential Appears as a Sharp Spike and Return

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Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

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An Oscilloscope Trace Plots Membrane Potential Against Time

A Flat Line at −70 mV Shows the Resting Potential

The Action Potential Appears as a Sharp Spike and Return

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account