The Nervous System: A Simple Animated Guide

The nervous system is organized into two main divisions.The Central Nervous System, or CNS, consists of the brain and spinal cord.The brain serves as the command center, processing all information and making decisions.The spinal cord acts as the main communication highway, carrying signals between the brain and the rest of the body.The Peripheral Nervous System, or PNS, consists of all the nerves throughout the body.These nerves form an extensive network, connecting every part of your body to the central nervous system.This entire system is made up of billions of specialized cells called neurons.These neurons form an intricate network, allowing information to flow throughout your entire body.Together, these systems work in harmony to control every function of your body.This complex organization allows for rapid communication throughout your entire body.When a neuron receives a stimulus, it generates an electrical signal called an action potential.This electrical impulse creates a rapid change in the neuron's membrane voltage.The action potential travels down the axon at speeds up to 120 meters per second.When the electrical signal reaches the axon terminals, it triggers the release of chemical messengers called neurotransmitters.These neurotransmitters cross the synaptic gap and bind to specific receptors on the receiving neuron.This chemical signal is then converted back into an electrical impulse in the receiving neuron, continuing the chain of communication.The nervous system performs three essential functions that work together seamlessly.First, sensory input collects information from our environment through our five senses.The brain then integrates this sensory information, processing it to make decisions about how to respond.Finally, motor neurons carry signals from the brain to muscles and glands, creating two types of responses.Voluntary responses are conscious actions, like deliberately reaching for and picking up an object.Involuntary responses are automatic reactions, like quickly pulling away from a hot surface to prevent injury.This intricate system of sensory input, integration, and motor output allows us to interact with our environment and respond appropriately to various situations.Thanks for learning about the nervous system's functions with Spark.E!