Resting and Action Potential — Prelims Questions

Which of the following statements correctly describes the primary mechanism for maintaining the resting membrane potential in a neuron?

During the depolarization phase of an action potential, what is the primary event that causes the rapid rise in membrane potential?

Which event is responsible for the repolarization phase of an action potential?

The 'all-or-none' principle of action potentials means that:

A neuron is in its absolute refractory period. What does this imply about its ability to generate another action potential?

If a drug specifically blocked the voltage-gated K$^+$ channels in a neuron, what would be the most likely effect on the action potential?