The All -Or -None Principle, Associated with the Action Potential

question 74

Multiple Choice

The all -or -none principle, associated with the action potential, states that

• A) following an action potential, the membrane will be repolarized by the opening of a potassium channel.
• B) all of the action potentials will be generated from the axon hillock.
• C) the positive feedback loop for the sodium channel is terminated by the inactivation gate.
• D) once membrane potential reaches threshold, an action potential will be generated and that action potential will always be the same magnitude.
• E) there is a positive feedback loop for sodium channels that results in a rapid membrane depolarization.

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