Threshold Is Not Arbitrary

Across the membrane, charge is uneven.

Positive and negative are separated.

This separation is maintained at rest.

The resting state is not neutrality.
It is stored tension.

Ions are distributed unequally.
Inside differs from outside.

Permeability is selective.
Conductance is controlled.

The potential is measurable.
It is stable within limits.

Stimulus approaches.
Change begins.

Channels respond to voltage.
They open abruptly.

Sodium moves inward.
The membrane depolarizes.

The shift is rapid.
It is not gradual persuasion.

If the threshold is not reached, the state returns.

If the threshold is crossed, the response is complete.

There is no partial action potential.
It either occurs
or it does not.

Peak is brief.

Sodium channels inactivate.
Potassium channels open.

Charge exits.
Repolarization follows.

The membrane does not remain excited.
It restores difference.

Refractory period prevents immediate repetition.

Not every stimulus produces response.
Timing matters.
Intensity matters.
Threshold governs outcome.

The impulse propagates along the membrane.

One region depolarizes.
The next follows.

Sequence is preserved.
Direction is maintained.

Energy sustains gradients that allow repetition.

Without maintained difference, no signal travels.

Without threshold, excitation becomes chaos.

Electrical activity depends on controlled imbalance.

The membrane holds charge until limit is reached.

And when limit is reached, response is decisive.

Afterward, restoration begins.
Stability is recovered.

The system does not remain in constant activation.

Persistent excitation is not strength.
It is dysfunction.

Life depends on tension that is regulated,
released at threshold,
and restored without delay.