_______ (Reduction of the Resting Potential) of an Axon Until

Multiple Choice

_______ (reduction of the resting potential) of an axon until it reaches a threshold value opens voltage-gated sodium (Na⁺) channels, making the membrane completely _______ to sodium ions (Na⁺) . The Na⁺ ions rush in, and the axon becomes briefly more positive inside than outside. This event is called an _______.

A) Depolarization; permeable; action potential
B) Upregulation; impermeable; action potential
C) Up-polarization; permeable; adverse reaction
D) Deregulation; impermeable; adverse reaction