Chapter 19

5. a bundle of nerve fibers
6. what your body does in reaction to a stimulus
7. thick colum of nervous tissue that links the brain to nerves
12. a neuron that carries nerve impulses
13. located in the skull
14. your body becomes physically dependent on that drug
17. where the brain and spinal cord are located
24. snail shaped tube lined with receptor cells
26. coordinates actions of your muscles
27. the period of adjustment that occurs when a person stops taking drugs
28. a flexible structure that focus light
29. can see nearby objects but not far away
32. a bruise like injury of the brain
33. clear tissue that covers the front of the eye
35. cells that carry information through your nervous system
36. can see far away but not up close
37. the opening in the eye through wich light enters
38. picks up stimuli from internal or external environment
39. where one neuron transfers an impulse to another structure
41. is a state in which a drug user needs larger and larger amounts of drugs to give them the same feeling

1. speed up body process
2. separates the center of the ear from the middle of the ear
3. a circular structure that surrounds the pupil
4. carry impulses toward the neurons cell body
8. a message that a neuron carries
9. interrupts input from the senses
10. controls involuntary actions
11. controls voluntary actions
15. synthetic chemicals that are similar to the hormones that your body produces
16. all of the other nerves not included in the central nervous system
18. a response that happened automatically
19. responsible for your sense of balance
20. when an organism reacts
21. sends an impulse to a muscle or gland
22. where a person is physically and emotionally dependent on alcohol
23. deliberate misuse of drugs for purposes besides medicine
25. slow down activity of central nervous system
30. carries impulses away from cell body
31. the layer of receptor cells
34. lies between the cerebellum and spinal cord
40. chemical taken into the body which causes changes in your body or behavior