Place These Steps of the Action Potential in the Correct

question 79

Multiple Choice

Place these steps of the action potential in the correct order. 1. Sodium ions channels return to the resting state and repolarization continues.
2) Voltage ^-gated sodium ion channels activate, sodium ions enter, and the axon section depolarizes.
3) As potassium ion channels return to resting state, the axolemma may hyperpolarize before returning to the resting membrane potential.
4) A local potential depolarizes the axolemma of the trigger zone to threshold.
5) Sodium ion channels inactivate, and voltage ^-gated potassium ion channels activate, so sodium ions stop entering and potassium ions leave, beginning repolarization.

• A) 2, 4, 5, 1, 3
• B) 4, 2, 5, 1, 3
• C) 4, 2, 3, 5, 1
• D) 4, 2, 1, 3, 5

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