Across
- 1. the gap that exists between individual nerve cells
- 4. the set of genes in an organism
- 5. the part of the peripheral nervous system that controls internal biological functions
- 12. twins who come from one fertilized egg; twins having the same heredity
- 13. the genetic transmission of characteristics from parents to their offspring
- 15. the expression of a particular trait in an organism
- 16. descended from ancestors with dissimilar genetics
- 17. a small part of the brain above the pons that arouses the brain, integrates sensory information, and relays it upward
- 19. a machine used to record the electrical activity of large portions of the brain
- 21. the basic building blocks of heredity
- 22. a chemical communication system, using hormones, by which messages are sent through the bloodstream
- 23. an imaging technique used to study the brain to pinpoint injuries and brain deterioration
- 24. nerves that run up and down the length of the back and transmit most messages between the body and brain
- 26. the part of the peripheral nervous system that controls voluntary movement of skeletal muscles
- 27. a part of the brain that covers the brain's central core, responsible for sensory and motor control and the processing of thinking and language
Down
- 2. the center of control of the endocrine system that secretes a large number of hormones
- 3. twins who come from two different eggs fertilized by two different sperm
- 6. the brain and the spinal cord
- 7. nerves branching beyond the spinal cord into the body
- 8. the different regions into which the cerebral cortex is divided
- 9. a measuring technique used to study brian structure and activity
- 10. an imaging technique used to see which brain areas are being activated while preforming tasks
- 11. a part of the brain located at the rear base of the skull that is involved in the basic processes of life
- 14. descended from ancestors with similar genetics
- 18. the chemical released by neurons, which determine the rate at which other neurons fire
- 20. chemical substances that carry messages through the body in blood
- 25. the long, thin cells of nerve tissue along which messages travel to and from the brain