Answer:
Step-by-step explanation:
If a membrane is hyperpolarized, it means that the membrane potential is more negative than its resting potential. To depolarize the membrane to threshold, a stimulus that increases the membrane potential towards the threshold potential is required. This stimulus must be of sufficient strength to overcome the membrane's resting potential and move the membrane potential closer to the threshold potential.
The type of stimulus required to depolarize the membrane to threshold will depend on the specific membrane and cell type. In general, an excitatory stimulus such as an electrical current or a neurotransmitter binding to a receptor on the membrane can cause depolarization. The strength and duration of the stimulus will determine whether the membrane potential reaches the threshold potential required to generate an action potential.