Question

in an action potential, which event directly follows repolarization?
multiple choice
threshold is reached
hyperpolarization of the membrane
depolarization of the membrane
hypopolarization of the membrane
the resting membrane potential is reinstated

Explanation:

The action potential has several phases. After repolarization (where the membrane potential moves back towards the resting state), the membrane can become hyperpolarized (more negative than the resting potential) due to the continued efflux of potassium ions. Threshold is reached before depolarization. Depolarization comes before repolarization. Hypopolarization is not a standard term in this context. Reinstatement of the resting membrane potential occurs after hyperpolarization (through ion - pump mechanisms).

Answer:

Hyperpolarization of the membrane