lesson 4 - nervous system

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Across
  1. 4. this word means "incoming"
  2. 5. this word means "outgoing"
  3. 6. the number of pairs of cranial nerves
  4. 8. the sympathetic nervous system causes the pupils to ?
  5. 10. this word means unconscious or involuntary
  6. 12. these are the nerve cells that nourish other nerve cells
Down
  1. 1. this division of the autonomic nervous system prepares us for emergencies
  2. 2. these motor neurons are found in the brainstem and cerebral cortex
  3. 3. this word means increased heart rate
  4. 7. this system controls our emotions
  5. 9. the parasympathetic nervous system ? heart rate
  6. 11. an axon is usually covered in the ? sheath