Circulation, Respiration, and Nervous System Crossword

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Across
  1. 5. special region of the heart that sets the tempo of the heartbeat
  2. 6. tiy air sacs in the lungs
  3. 8. selects which information to pass on
  4. 10. a nervous system that is made up mostly of nerves that carry signals into and out of the CNS
  5. 12. prepares the body for intense, energy-consuming activities
  6. 15. a sheet of muscle that borders the bottom of the lungs
  7. 16. the alternating processes of inhalation and exhalation
  8. 18. circulatory system in which the circulating fluid is pumped through open-ended vessels and flows out among the cells
  9. 19. the movement of molecules along a concentration gradient, from an area of higher concentration to lower concentration
  10. 21. voice box
  11. 24. short, numerous, and highly branched extensions
  12. 25. when the heart is relaxed and blood flows in
  13. 26. the force that blood exerts against the walls of your blood vessels
  14. 29. bits of cytoplasm pinched off from larger cells in the bone marrow
  15. 30. part of brain that controls breathing
Down
  1. 1. the voltage across the plasma membrane of a resting neuron
  2. 2. carries blood away from the heart
  3. 3. a type of breathing when air rushes in through your mouth and nostrils toward the region of lower pressure
  4. 4. a gelatinous bundle of nerve fibers that lies inside the spinal column
  5. 7. an extensive system of internal tubes that branch throughout the body
  6. 9. part of an animal where oxygen from the environment diffuses into living cells and carbon dioxide diffuses in the surrounding environment
  7. 11. involves extreme mood swings
  8. 13. planning center for body movements
  9. 14. where the digestive and respiratory systems meet
  10. 17. extensions, or outfoldings, of the body surface where the respiratory surfaces are found in aquatic animals
  11. 20. a nervous system that carries signals to and from skeletal mucles, mainly in response to external stimuli
  12. 22. circulatory system in which blood is confined to vessels and is distinct from the intersitial fluid
  13. 23. returns blood back into the heart
  14. 27. one of the deadliest forms of cancer
  15. 28. circuit that carries blood between the heart and the lungs