Nervous System 06/01/12 pages 159-160 Know: What are the 3 functions of the nervous system?

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Nervous System 06/01/12 pages Know: What are the 3 functions of the nervous system?

Functions Process 1.Receiving info – inside and outside body 2.Responding to info – reaction to stimulus (change/signal) 3.Maintaining homeostasis Neurons (nerve cells) carry nerve impulses (electrical or chemical messages)

Process Dendrite Axon Impulses begin in dendrite, move toward cell body, then down axon. Carries impulse toward cell body Carries impulse away from cell body (Draw picture/label below)

Axons & Dendrites

ProcessBrain receives message and sends impulses to muscles. Impulses are passed from one nerve to another or to an organ through chemicals that jump the synapse (gap between nerve cells)

Types Reflex 1.Central – control center of body, brain and spinal cord 2.Peripheral – carries impulses between central nervous system and rest of body -Somatic nervous system – controls voluntary actions (texting) -Autonomic n.s. – controls involuntary actions (heart beat) Automatic involuntary response to danger. Ex: your arm pulls back if you touch something hot

Evidence & Summary Evidence: TB page 633, Draw, label, color

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