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A-Level Biology OCR A

Threshold Ap Stimulus Explain Meant Principle Level Trigger

The all-or-nothing principle states that an action potential will only be generated if the stimulus reaches a threshold value; if it does, the action potential will always be the same size, regardless of stimulus intensity.

The all-or-nothing principle states that an action potential will only be generated if the stimulus reaches a threshold value; if it does, the action potential will always be the same size, regardless of stimulus intensity.

Front Explain what is meant by the all or nothing principle.
Back All or nothing principle:
  • Only a certain level of stimulus (threshold value) will trigger a response
  • If threshold is reached AP will always be created, no matter how large the stimulus is, AP will be same size
  • If threshold not reached, no AP triggered

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