What is the first step in how the nervous system functions?

The first step in how the nervous system operates is receiving information. This initial phase involves sensory receptors detecting stimuli from the environment, such as light, sound, temperature, and pressure. These receptors convert the detected stimuli into electrical signals that are transmitted to the central nervous system (CNS) for further processing.

This step is crucial because the nervous system's ability to respond appropriately to stimuli relies on accurate information gathering. Without this initial reception of sensory input, the processes of processing information, issuing commands, and storing information would not occur, as there would be no data for the nervous system to work with. Thus, the foundational role of receiving information sets the stage for all subsequent actions and responses within the nervous system.