Unit 12 Crossword

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Across
  1. 2. sets the tempo of the heart beat
  2. 3. brain and spinal cord
  3. 4. long, single fiber, conducts signal to another neuron
  4. 5. where digestive and respiratory organs meet
  5. 6. heart chamber that pumps blood away from the heart
  6. 8. voice box
  7. 11. master control center
  8. 12. relay point between cells
  9. 13. lobe part of brain for vision
  10. 14. anything that causes a nerve signal to start
  11. 17. carry signals to skeletal muscles
  12. 20. carry blood to the heart
  13. 21. conducts signals from integration to effector cells
  14. 22. heart chamber that receives blood
  15. 23. moist internal surface is exposed to air,O2 diffuses into blood
Down
  1. 1. method of adding dye to blood to determine if you have a blood clot
  2. 2. nerves that go in and out of CNS
  3. 3. presence of CNS separate from PNS
  4. 7. rhythmic contraction and relaxation of the heart
  5. 9. carries blood between heart and rest of body
  6. 10. layers of connective tissue for protection
  7. 15. hormone released during stress
  8. 16. cluster of air sacs
  9. 18. caused by iron deficiency
  10. 19. relays signals to another neuron or effector