The Brain Part 2 The Nervous System ? Series of neurons connected to make pathways through the body Central Nervous System ? Brain ? Spinal cord ? Connects the brain with rest of nervous system ? Two kinds of neuron pathways ? Afferent ? Sensory neurons ? Carry information to the brain ? Efferent ? Motor neurons (movement) ? Carry information away from the brain ? Afferent and efferent pathways works together ? Afferent neurons communicate stimuli to brain ? Neurons in brain "decide" what to do with it ? Efferent neurons transmit "decision" to muscles ? Muscles carry out action ? But brain is not always involved in action ? Reflexes ? afferent neurons communicate directly with efferent (skip brain) ? Information eventually reach brain, but AFTER action is carried out Preipheral Nervous System ? Connects brain, spian cord to rest of body ? Two sub-sets ? Somatic nervous system ? Voluntary ? Connects brain, spinal cord to muscles ? Autonomic nervous system ? Involuntary ? Connects bodt to gland and organs ? Two ports ? Sympathetic - triggers fight-or-flight response ? Parasympathetic - "undoes" sympathetic system function
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