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Across 2. the middle of the brain 3. Chain of amino acids 7. the chemicals that are released by one neuron at the synapse and that affect another 8. Structure of the cell that contains the chromosomes 10. a rapid depolarization and slight reversal of the usual polarization 12. the intermediate level of the midbrain 19. Structure that separates the inside of the cell from the outside environment 20. Gap between two neurons 21. The nerves outside the brain and spinal cord 23. network of thin tubes that transport newly synthesized proteins to other locations 25. endocrine gland attached to the base of the hypothalamus 26. an insulating material composed of fats and proteins 27. facilitates vegetative, nonemergency responses by organs 30. a swelling where the axon exits the soma 31. Prepares organs for vigorous activity 33. Brain and spinal cord 35. simple sugar 36. membranes that surround the brain and spinal cord: dura mater, arachnoid, pia mater 37. automatic muscular response to stimuli

Down 1. increased polarization 2. Structure of the cell that performs metabolic activity 4. Information away from the structure 5. Toward the stomach 6. Cell bodies and dendrites 9. posterior part of brain consisting of medulla and pons, midbrain, and cerebellum 10. protein mediated process that expends energy to pump chemicals from the blood into the brain 11. cells that receive information and transmit it to other cells 13. Toward the back 14. a difference in electrical charge between two locations 15. the mechanism that keeps most chemicals out of the vertebrate brain 16. reduction of polarization 17. The nerves that convey messages from the sense organs to the CNS and from the CNS to the muscles and glands 18. Part of CNS found within the spinal column 22. myelinated axons 24. a graded depolarization 28. elaborated extension of the spinal cord 29. Synthesizes new protein molecules 30. Information into the structure 32. the roof of the midbrain 34. temporary hyperpolarization of a membrane