Final answer:
The threshold is the minimum depolarization required to open Na+ voltage-gated channel activation gates, crucial for the initiation of an action potential.
Explanation:
Threshold is the minimum depolarization needed to open Na+ voltage-gated channel activation gates. Once the threshold is reached, the activation gate opens, allowing Na+ to rush into the cell, leading to an action potential. The threshold is crucial for initiating the all-or-nothing event of an action potential.
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