Science cross word puzzle

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