Level One. Nervous System: Provides the biological basis for psychological experience
Level Two. Peripheral Nervous System: Carries information to and from the central nervous system
Level Three. Somatic Nervous System: Conveys sensory information to the central nervous system and sends motor messages to muscles
Level Three. Autonomic Nervous System: Serves basic life functions, such as the beating of the heart and response to stress
Level Four. Sympathetic Nervous System: Readies the body in response to threat; activates the organism
Level Four. Parasympathetic: Calms the body down; maintains energy
Level Two. Central Nervous System: Directs psychological and basic life processes; responds to stimuli
Level Three. Spinal Cord: Receives sensory input; sends information to the brain; responds with motor output
Level Three. Brain: Directs psychological activity; processes information; maintains life supports
Level Four. (Brain): Forebrain, midbrain, hindbrain
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