Nervous system

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Nervous system

  1. 1. Nervous System<br />6th Grade Science<br />
  2. 2. I. Function<br />A. Receive information (Stimulation)<br />B. Store information<br />C. Make decisions<br />D. Send Responses to Body (Response)<br />E. Maintain Homeostasis<br />
  3. 3. II. Neuron<br />A. Cell<br /> 1. Large cell body<br /> 2. Thread like projections – Dendrites<br /> 3. One large projection – Axon<br /> 4. Many small endings – Axon Bulbs<br />B. Pathway<br /> 1. Information enters through dendrites<br /> 2. Processed in cell body<br /> 3. Travels down axons<br /> 4. Exits out axon bulbs<br /> 5. Speed = 120 meters/second<br /> 6. Numbers = Many billions<br />
  4. 4. C. Synapse <br />1. Axon Bulb<br />i. Release chemical<br /> a. Neurotransmitter<br /> b. Exocytosis<br /> ii. Signal dendrite<br /> iii. Up to 10,000 links<br />
  5. 5. III. Parts<br />A. Central Nervous System (CNS)<br />1. Brain<br />i. Number = 100 billion neurons<br /> ii. Parts <br /> a. Cerebrum (thought)<br /> b. Cerebellum (muscle)<br /> c. Brain Stem (life support)<br />2. Spinal Cord (link to PNS)<br />
  6. 6. B. Peripheral Nervous System (PNS)<br />1.Connects body to CNS<br />2. Parts<br />i. Somatic Nervous System<br />a. Voluntary body functions<br />ii. Autonomic Nervous System<br /> a. Involuntary body functions<br />
  7. 7. IV. Reflexes<br />A. Rapid Response (without knowledge)<br /> 1. Sensory Neuron Detects<br /> 2. Spinal Cord Sends Response<br /> 3. Nerves Move Muscles in hand<br /> 4. Spinal Cord Notifies Brain of action taken<br />
  8. 8. V. Injuries<br />A. Concussions<br /> 1. Bruising Brain<br /> 2. Brain Pushed against skull<br /> 3. May result in death or long term damage<br />B. Spinal Cord<br /> 1. Lack control below injured nerves<br /> 2. Result in paralysis or death<br />
  9. 9. VI. Drugs<br />A. Definition: Any chemical that changes behavior<br />B. Drug Abuse: Deliberate misuse of drug<br /> 1. Mood changes<br /> 2. Lying & Cheating<br /> 3. Forgetfulness<br /> 4. Withdrawn<br /> 5. Aggressive<br /> 6. Slurred speech<br />
  10. 10. C. Tolerance<br />1. Body adjusts to drug so large amounts are needed<br />2. Overdose becomes higher risk<br />
  11. 11. D. Addiction<br />1. Body altered by drug<br />2. Physical dependence on chemical<br />3. Sever withdrawal symptoms may occur when normal body chemistry is restored<br />
  12. 12. E. Other Effects<br />1. Pathogens for dirty needles<br />2. Legal problems<br />3. School/work problems<br />
  13. 13. F. Types of Drugs<br />1. Depressants<br />i. Slow central nervous system<br />ii. Muscles relax to point of sleep<br />2. Stimulants<br />i. Speed up Central Nervous System<br />ii. Rapid heart rate, breathing, …<br />3. Inhalants: Into lungs<br />4. Hallucinogens: see or hear things not real<br />5. Steroids<br />i. Increase muscle size<br />ii. Internal organ damage<br />iii. Mood alteration<br />
  14. 14. 6. Alcohol<br />i. Absorbed directly by stomach<br />ii. Blood Alcohol Concentration (BAC)<br /> a. 0.1 BAC is 0.1% alcohol<br /> b. 0.08 BAC is legally drunk<br />iii. Danger<br /> Every two minutes someone dead by alcohol<br />iv. Long Term Abuse<br /> a. Mental change<br /> b. Liver Damage<br />
  15. 15. Quiz<br />

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