Louisiana Esthetics State Board Practice Test 2025 – Comprehensive Exam Prep

The correct answer identifies the three primary subsystems that compose the nervous system: the central nervous system, the peripheral nervous system, and the autonomic nervous system.

The central nervous system, which encompasses the brain and spinal cord, serves as the main control center for processing and sending information throughout the body. This subsystem is responsible for integrating sensory data, controlling motor functions, and facilitating cognitive processes.

The peripheral nervous system is a network of nerves that exists outside of the central nervous system, connecting it to the limbs and organs. It plays a critical role in transmitting sensory information to the central nervous system and relaying motor commands back to the muscles.

The autonomic nervous system, a division of the peripheral nervous system, regulates involuntary physiological functions such as heart rate, digestion, and respiratory rate. It is further subdivided into sympathetic and parasympathetic systems, which control the body's fight-or-flight response and rest-and-digest activities, respectively.

Options that reference other components, such as the brain and spinal cord (as specific structures) or classifications like motor and sensory (which categorize neuron types), do not comprehensively cover the overarching systems of the nervous system as a whole. Instead, they reflect aspects or functionalities rather than the subsystems that