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Category - NSCA

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What principle is at play when the electrical threshold of the nerve cell membrane is reached, causing the propagation of the action potential?
  1. The Schwann cell principle of conduction
  2. The all-or-none principle
  3. The sliding filament principle
  4. The principle of repolarized propagation
Explanation
Answer: B - The all-or-none principle is at play when the electrical threshold of the nerve cell membrane is reached, causing the propagation of the action potential. As the potential travels the length of the nerve, saltatory conduction occurs as the potential proceeds from one node of Ranvier to the next, all the way to its target organ or muscle.
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