Chapter 6

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