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Psychologyjanuary25 - Psychology The Nervous System...

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Psychology January 25, 2012 The Nervous System Electro-chemical communication system Two major branches o Central nervous system: brain and spinal cord o Peripheral nervous system: all nerves outside of brain and spinal cord Peripheral Nervous System Branches Somatic nervous system: nerves that connect to voluntary skeletal muscles and sensory receptors o Afferent nerve fibers: carry info to CNS from body o Efferent nerve fibers: carry info to body from CNS Autonomic nervous system: made up of nerves that connect to the heart, blood vessels, organs, and glands. Autonomic nervous system Sympathetic nervous system: arousing system that mobilizes body’s resources for emergencies. Parasympathetic nervous system: calming system that tries to conserve body’s resources when there isn’t an immediate threat (causes heart rate to go down, breathing go down so we’re not wasting energy) Parts of the CNS Spinal cord: contains bundles of axons that carry information from brain to body and vice versa Brain can be divided into 3 parts: forebrain, midbrain, and hindbrain. Hindbrain Lower part of brain: includes medulla, pons, and cerebellum o Most primitive part (things that keep us alive) o Mainly responsible for automatic survival functions o
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