medium · MCAT bio-biochem
What occurs during the depolarization phase of an action potential when the threshold potential is reached?
- Ligand-gated channels close to prevent further neurotransmitter interference.
- The Na^+/K^+ pump reverses direction to rapidly change the ion concentrations.
- Voltage-gated Na⁺ channels open, allowing an influx of sodium ions into the cell.
- Voltage-gated K⁺ channels open, allowing an efflux of potassium ions out of the cell.
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