An Action Potential Is Regarded as an Example of a Positive

question 82

Multiple Choice

An action potential is regarded as an example of a positive feedback.Which of the following examples below best illustrates the positive feedback aspect of an action potential?

• A) The sodium potassium pump consistently moves ions as long as ATP is available, and regardless of membrane potential changes.
• B) Potassium permeability is about 25 times greater than sodium ions.
• C) Voltage gated potassium ion channels open slowly and remain open long enough to cause hyperpolarization.
• D) A threshold stimulus will cause the opening of voltage gated sodium ion channels that will cause further depolarizing stimulus. This stimulus will open still more voltage gated sodium ion channels.

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