Science cross word puzzle

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Across
  1. 2. a network of nerves that relaxes your body after periods of strees or danger
  2. 3. a subdivision of your peripheral nervous system, which is all of your nervous system except your brain and spinal cord
  3. 6. the central part of neurons that includes the nucleus
  4. 9. an organ or cell that able to respond to light,heat or other external stimulus
  5. 10. a nucleic acid present of chromosome
  6. 11. it is the firts codon of a messenger RNA transcript translated by a ribosome
  7. 13. it is a chemical substance that nuetralizes alkalis dissolves some metals
  8. 14. it is the largest part of brain
  9. 19. this is made up of brain and spinal cord
  10. 22. a network of nerves that helps your body active its "fight of flight"respones
  11. 23. an amino acid that is used in the biosynthesis of proteins
  12. 24. a network of nerves that runs throughout the head,neck and body
  13. 25. it is where a neurons receives imput from other cells
  14. 26. it is a nerve cell that are activated by sensosy input from the
  15. 28. it is a type of genitic change that involves the absume of a segment of dna
  16. 29. it is the cable that several times thinner than a human hair
Down
  1. 1. it is a condition in which a person has an extra chromosome
  2. 4. portion of the brain in the back of the head between the cerebrum and the brain stem
  3. 5. it function based on sensory input,integration and motor output
  4. 7. any living biological entity
  5. 8. this is a single stranded molecule of RNA
  6. 12. it can be used by skeletal muscle to give energy during exercise
  7. 13. it regulate involuntary physiological processes
  8. 15. small pocket of space between two cells
  9. 16. it is the main constituent of chromosomes
  10. 17. the most complex part of human body
  11. 18. an amino acid or a building block for proteins
  12. 20. it is a complex circuits throughout the body that allows both voluntary and involuntary movements
  13. 21. it is the structure that connects the cerebrum of the brain to the epinal cord and the cerebellum
  14. 27. it is a column of nerve tissue that runs from the base of the skull