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