1. Nervous System
Receives info about internal & external environ & responds to that info
Helps maintain Homeostasis
Allows you to speak, smell, taste, hear, see, move, think & experience emotions

3. Pathway of an Impulse

4. 2 Subdivisions Central Nervous System includes brain spinal cord
Cerebrum, Cerebellum, Medulla
spinal cord
Peripheral Nervous System
Nerves
Nervous system worksheet – label diagram

6. Central Nervous System
Brain
Largest organ in this system
Controls most functions of the Body

7. Central Nervous System
Spinal Cord
Thick column of nerve tissue
Links brain to nerves

8. Brain Neurons called Interneurons Protected by Skull
3 layers of connective tissue
Fluid between middle and innermost layer

9. Brain Has 3 Parts Brain Stem Medulla part connected to spinal cord
controls involuntary body actions (breathing, heartbeat)

10. Brain Has 3 Parts Cerebellum 2nd largest part of brain
Gives body its sense of balance
Coordinates actions of muscles

11. Brain Has 3 Parts Cerebrum - largest part
Carries out learning, remembering, and making judgments
Interprets input from the senses
Controls thought and voluntary movement
Nervous system at work worksheet – label diagram and match functions

12. Cerebrum Has 2 hemispheres left for right side of body
right for left side of body
(axons cross over to opposite side of body in spinal cord)

13. hyperlink to website with more info

14. Central Nervous System
Spinal Cord
Link between Brain and Peripheral Nervous system
Protected by
Vertebral column, layers of connective tissue and spinal fluid

15. Peripheral Nervous System
Network of Nerves
Branch out from Central Nervous system
Communication pathways that connect the CNS to the rest of the body

16. 2 Groups of Nerves Somatic Autonomic Voluntary actions Examples
Involuntary actions

17. 2 Types of Neurons Sensory Neurons receptors that detect changes
Motor Neurons
Make muscles contract

18. The Connection Central nervous system receives info from
Sensory neurons and
sends info through
Motor neurons

19. Reflex
Automatic response that occurs rapidly and without conscious control
Can respond before impulse reaches brain (spinal cord back to muscle)
Helps protect the body

20. Nervous System Injuries
Concussion
To decrease chances of Injury
Wear a helmet during activities with risk of hitting head

21. Nervous System Injuries
Spinal cord injuries
Damaged axons cannot pass impulses
Results in Paralysis
Most common cause?
Car accidents

22. Senses
Pages

23. The Affects of Drugs and Alcohol

24. Any chemical that causes a physical or emotional change in a person
Drug
Any chemical that causes a physical or emotional change in a person

25. The deliberate misuse of drugs for purposes other than medical
Drug Abuse

26. Use, Misuse, or Abuse?
Taking a medicine properly and in its correct dosage
Improper use of a drug
Intentional improper use of a drug

27. Tolerance
The state in which a drug user needs larger and larger amounts of drugs to produce the same effect on the body

28. Withdrawal
The period of adjustment that occurs when a person stops taking a drug

29. Addiction
The state in which a drug user is emotionally and physically dependent on a drug
The person is used to the feelings and moods produced by the drug

30. Signs of Misuse or Abuse
Difficulty focusing eyes, glazed look
Uncharacteristically passive or aggressive
Decline in personal appearance
Unexplained bruises or accidents
Loss of memory

31. Signs of Misuse or Abuse
Decline in school or work performance
Frequent absences
Damaged relationships with family members
Changes in peer group or friendships

32. How can you Help? Seek adult or professional help
Stop covering or making excuses for them
Talk to and express concern for them
Ask another friend
to help

33. Kinds of Drugs Depressant Stimulant Inhalant Slows the CNS
Speeds up body processes
Inhalant
Mood altering affects
Breathed in

34. Kinds of Drugs Hallucinogen Steroid distorts senses
See or hear things that aren’t there
Steroid
Synthetic chemical (hormone)
Improves performance

35. Kinds of Drugs Alcohol depressant relaxation widens blood vessels
interferes with judgment and reflexes
affects coordination

36. Affects of Alcohol
Impacts every system of the Body
Through the Blood Stream

37. Alcoholism
Disease in which a person is both physically addicted to and emotionally dependent on alcohol
Requires withdrawal to give up Alcohol

38. How Drugs Enter the Body
Swallowed
Inhaled
Absorbed through skin or mucus membranes
Injected into a muscle or vein
Absorbed into blood stream

39. Case Study # 3
List the 5 C’s and the questions that go with each step.
Follow the example I gave you at the beginning of the semester.
C C C C C

40. You are hanging out at a friend’s house on Friday night
You are hanging out at a friend’s house on Friday night. His parents aren’t home and his older brother offers you a drink from the family bar. You have never tasted alcohol before but you have learned in Science class that it really isn’t good for you. Your friend says it is no big deal and that a little won’t hurt you. Use the 5 C’s to make a decision about what you will do.