Circulation-Respiration-Nervous System Crossword Puzzle

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Across
  1. 2. Blood vessel that carries blood to the heart
  2. 3. Anything that causes a nerve signal to start
  3. 4. Disease that causes alveoli to disintigrate
  4. 6. Organs that carry out respiration
  5. 8. I would tell a joke about chemistry, but all the good ones ( )
  6. 10. Where digestive and respiratory systems meet
  7. 12. Lower part of heart that pumps blood
  8. 15. Brings blood to heart from lower body
  9. 19. Valve between atria and ventricles of heart
  10. 25. Upper part of heart that receives blood
  11. 27. Part of the brain that regulates heartbeat and respiration rate
  12. 28. What did Uranium, Sulfur, Titanium, Nitrogen, and Potassium say to the skunk?
  13. 31. A chemical that carries information from a neuron to another cell
  14. 34. Nerve cell specialized for carrying signals from one part of body to another
  15. 35. Brings blood from lungs back to heart
Down
  1. 1. Branched, short, receive incoming messages from other cells
  2. 5. Brings blood from heart to lungs
  3. 7. Brings blood to heart from upper body
  4. 9. Part of a neuron that relays signals to another neuron or effector
  5. 11. Too much carbon dioxide leaves the blood
  6. 13. Part of the brain that allows balance and coordination
  7. 14. Caused by iron deficiency
  8. 16. Inside red blood cells, carries oxygen
  9. 17. Part of the brain that allows learning, emotions, activity, etc.
  10. 18. self-propagating change in the voltage across the plasma membrane
  11. 20. Tube that expands from larynx to bronchi
  12. 21. interferes with delivery of oxygen to body causing death
  13. 22. Clusters of air sacs, where gas is exchanged with blood vessels
  14. 23. Sheet of muscle that controls inhalation and exhalation in lungs
  15. 24. Where do chemists put their dirty beakers? In the ( )
  16. 26. Relaxation phase of heart
  17. 29. Layers of protective tissue around brain
  18. 30. Copper is leaving a friend’s house. As he was leaving he said ( )
  19. 32. Blood vessel that takes blood away from the heart
  20. 33. What is the study of real estate?