Action potential notes

Action potential. depolarization

Notes made on an ipad pro for physiology action potentials using goodnotes

Action potentials are brief, rapid, large changes in the membrane potential in which the potential actually reverses. They are usually initiated as a result of spread from graded potentials. Simil…

There are four main stages to an action potential: depolarisation, repolarisation, hyperpolarisation, and the return to resting potential. Voltage-gated ion channels are needed for these processes.

The main difference between resting potential and action potential is that resting potential is the resting voltage or the membrane potential of a non ...

What is the difference between Graded Potential and Action Potential? Graded potential may be transmitted over short distances; action potential may be ...

This image displays an action potential traveling down the axon. In the place of the action potential, the membrane potential is the opposite sign as the rest of the membrane, and it is followed my a refractory period, so the potential is one directional.

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An action potential is a rapid rise and subsequent fall in voltage or membrane potential across a cellular membrane with a characteristic pattern.

Field Guide to ParaMagic

When an action potential occurs at one node (of Ranvier; whith a lots of voltage-gated Na+ and K+ channels) the same intracellular and extracellular currents are created except that the myelin dramatically reduces the current across the membrane so that the current that flows to the next node is strong enough to generate an action potential. This continues down the length of a myelinated axon with the action potential jumping from one node to the next.

Action potential graph with steps

Neurons firing na channels activate de polarizing after passing the threshold k blocks na channels by ball and chain block and k floods out over shooting before resetting

“Maintenance of resting membrane potential. The action of Na+/K+ ATPase, Na+ leak channels, and K+ leak channels creates and maintains a resting membrane potential of -70mV” until threshold is reached at ~-55 to -40 mV.

What causes this consistency? I read the previously asked questions on this site none of them carry an answer to this question.