The nervous system coordinates all the activities of the body. It recieves information from the senses, decides what action to take, then sends instruction to the relevant system to perform that action. Most of the system is automatic. Impulses can traverse across neurons at speeds of two hundred and fifty miles per hour, ensuring that many of its transmissions are nearly instantaneous.
A network of sensory nerves throughout the body sends information to the spinal cord. Sensory nerves gather information for the brain regarding the environment, both internal and external. Vital reflexes are triggered form the cord, but most signals pass through the brain. The instructions then run back down the cord.
The brain is made up of three main parts. Cerbellum controls muscle activity and balance. The brain stem controls automatic tasks such as breathing. The Cerebrum does the thinking.
