Equilibrium Potential¶

For channels that are permeable to only a single type of ion, the reversal potential is identical to the equilibrium potential of the ion.

Version: v1 · 2026-09-28 · History
Domain-specific #: 9295
Domain group: Natural Sciences
Origin domain: Neuroscience
Subdomains: Membrane Physiology, Electrophysiology → Neuroscience

Core Idea¶

Equilibrium Potential is treated here as the recurring natural science, engineering, and health identity summarized by this source-grounded definition: For channels that are permeable to only a single type of ion, the reversal potential is identical to the equilibrium potential of the ion. In a biological membrane, the reversal potential is the membrane potential at which the direction of ionic current reverses. At the reversal potential, there is no net flow of ions from one side of the membrane to the other.

Scope of Application¶

Equilibrium potential. The equilibrium potential for an ion is the membrane potential at which there is no net movement of the ion.
Equilibrium potential. The flow of any inorganic ion, such as Na + or K + , through an ion channel (since membranes are normally impermeable to ions) is driven by the electrochemical gradient for that ion.
Equilibrium potential. This gradient consists of two parts, the difference in the concentration of that ion across the membrane, and the voltage gradient.
Equilibrium potential. The voltage gradient at which this equilibrium is reached is the equilibrium potential for the ion and it can be calculated from the Nernst equation.
Mathematical models and the driving force. We can consider as an example a positively charged ion, such as K + , and a negatively charged membrane, as it is commonly the case in most organisms.

Clarity¶

A clear use of Equilibrium Potential names the carrier, the operative relation, and the conditions under which the source treats the identity as present. The minimal definition is For channels that are permeable to only a single type of ion, the reversal potential is identical to the equilibrium potential of the ion.

Manages Complexity¶

Equilibrium Potential compresses multiple natural science, engineering, and health details into a stable diagnostic relation. The source shows both the central mechanism—the experiment was performed by lowering the external Na + concentration, which lowers (makes more negative) the Na + equilibrium potential and produces a negative shift in reversal potential.—and the practical consequence—relatedly, the membrane current per unit area due to the type i ion channel is given by.

Abstract Reasoning¶

Type the carrier. Identify the natural science, engineering, and health entities to which the claim applies.
State the relation. Use the source-grounded identity: For channels that are permeable to only a single type of ion, the reversal potential is identical to the equilibrium potential of the ion.
Check operation and conditions. This gradient consists of two parts, the difference in the concentration of that ion across the membrane, and the voltage gradient.
Demand recognition evidence.

Knowledge Transfer¶

Within the home domain. Knowledge about Equilibrium Potential transfers literally when a new case preserves the same carrier type, relation, and recognition test. The equilibrium potential for an ion is the membrane potential at which there is no net movement of the ion. The flow of any inorganic ion, such as Na + or K + , through an ion channel (since membranes are normally impermeable to ions) is driven by the electrochemical gradient for that ion. Beyond the home domain. No canonical parent is asserted for Equilibrium Potential.

Neighborhood in Abstraction Space¶

Equilibrium Potential sits in a moderately populated region (57^th percentile for distinctiveness): it has near-neighbors but no dense thicket of look-alikes.

Family — Unclustered & Miscellaneous (2551 abstractions)

Nearest neighbors

Computed from structural-signature embeddings · 2026-10-08