The threshold potential of a membrane is the minimum depolarization needed to operate the voltage gated sodium and potassium channels.
Threshold potential is the critical limit up to which the membrane should be depolarized to generate any action potential. When the limit is reached an action potential is generated such as in case of neurons.
As the threshold is reached the voltage gated sodium and potassium channels open disturbing the membrane's electric potential. Within seconds the action potential travels through the axons and reaches the end. The axon ends has neurotransmitters that help to depolarize other neurons and generate action potential in them.
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