Chapter 6

4. the part of the peripheral nervous system that controls internal biological functions
6. an imaging techique used to study the brain to pinpoint injuries and brain deterioration
8. chemical substances that carry messages through the body in blood
9. twins who come from one fertilized egg; twins having the same heredity
10. the different regions into which the cerebral cortex is divided
11. the genetic transmission of characteristics from parents to their offspring
13. the gap that occurs between individual nerve cells
15. brain and spinal cord
16. nerves that run down the length of the back and transmit most messages between the body and the brain
18. a part of the brain that covers the central core
19. a part of the brain located at the rear of the skull that is involved in the basic processes of life
22. the chemicals released by neurons which determines the rate at which other neurons fire
23. the center of control of the endocrine system that secretes a large number of hormones

1. a small part of the brain above the pons that integrates sensory information and relays it upward
2. an imaging technique used to study brain structure and activity
3. the part of the peripheral nervous system that controls voluntary movement of skeletal muscles
5. a chemical communication system, using hormones by which messages are sent through the bloodstream
7. an imaging technique used to see which brain areas are being activated while performing tasks
12. nerves branching out from the spinal cord
14. the basic building blocks of heredity
17. twins who come from two different eggs and two different sperms
20. a machine used to record the electrical activity of large portions of the brain
21. the long thin cells of nerve tissue along which messages travel to and from the brain