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The Nervous System Chapter 6 Functions • Receives information • Responds to information • Maintains homeostasis Divisions of the Nervous System Central Nervous System • Brain • Spinal Cord Peripheral Nervous System • Network of nerves that branch out from central nervous system • Somatic-voluntary actions • Autonomic-involuntary actions Regions of the Brain • Cerebellum- balance and coordination • Cerebrum-learning, memory • Brain Stem- involuntary actions (breathing, heart beat) Nervous System Injuries Concussions • Bruise-like injury of brain • Occurs when soft tissue collides against skull • Can cause headache, dizziness, confusion, memory loss, brain damage Spinal Cord Injuries • Occur when spinal cord is bruised or cut • Impulses can no longer travel along axons • Can result in paralysis Receiving Information • Your senses are used to receive information from the environment • Include taste, touch, smell, sight, hearing Responding to Information • Stimulus- change in environment • Response-reaction to change Structure of a Neuron Kinds of Neurons • Sensory neuron • Interneuron • Motor neuron How nerve impulses travel • Travel up to 120 meters per second • Axons release chemicals to help nerve impulse travel across synapse Reflexes • Automatic response that occurs rapidly and without conscious control • Helps protect your body