Science cross word puzzle

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