Multiple choice

The stimulus required to open enough Na+ channels to initiate depolarization is called _____.

  1. quick stimulus

  2. threshold stimulus

  3. membrane stimulus

  4. All the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The minimum stimulus required to open enough voltage-gated Na+ channels to initiate depolarization is called the threshold stimulus (or threshold potential). This critical value must be reached for the all-or-nothing action potential to be triggered.

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