When the membrane is at rest, are the sodium ions more...

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Key Concepts

Resting Membrane Potential

This is the difference in electric potential across a cell's plasma membrane under non-excited conditions. It is primarily determined by the distribution of ions, such as sodium and potassium, across the membrane, which establishes a voltage gradient essential for cellular signaling.

Ion Concentration Gradients

These gradients refer to the unequal distribution of ions on either side of the cell membrane. Typically, sodium ions are more concentrated outside the cell while potassium ions are more concentrated inside, a disparity that is fundamental to the cell's ability to generate electrical signals.

Active Transport Mechanisms

Processes like the sodium-potassium pump actively transport ions against their concentration gradients using energy (ATP). This mechanism is crucial for maintaining the ion concentration gradients that underlie the resting membrane potential and prepare the cell for rapid changes during activities such as action potentials.

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