Final answer:
The time period during which another neural impulse cannot be generated immediately after an action potential is called the absolute refractory period, ensuring discrete signaling in neurons.
Step-by-step explanation:
The neurons in Michael's arm just sent a neural impulse, and it will be 1-2 milliseconds before another neural impulse can be generated. This brief time period, when another neural impulse cannot occur, is called the absolute refractory period. During this time, the voltage-gated Na+ channels are inactive, and even a strong stimulus won't trigger another action potential. The absolute refractory period ensures that each action potential is a separate, discrete event and allows the neuron to reset before firing again. The membrane quickly repolarizes, preparing for the possibility of a future action potential. This period is crucial for the proper functioning of neurons and is a fundamental concept in understanding how neural communication occurs.