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Nervous System: Neuron, Synapse, Reflexes · Zoology

The 'All-or-None' law of nerve conduction states that:

  1. All neurons in a nerve fire at once
  2. An action potential happens completely or not at all once threshold is reached
  3. The strength of an action potential increases with the strength of the stimulus
  4. Neurons either use $Na^{+}$ or $K^{+}$ but never both
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Correct answer: An action potential happens completely or not at all once threshold is reached

The amplitude and speed of an action potential are independent of the stimulus intensity. As long as the threshold is reached, a full-sized action potential is generated; if not, no impulse is sent.

Difficulty: Medium Question 9 of 20

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