The Nervous System

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Across
  1. 5. The resting potential outside of a neuron has a ___ charge.
  2. 6. This is part of the motor nervous system is voluntary and sends signals to the skeletal muscles.
  3. 11. Non-ciliated ____ cells secrete cerebrospinal fluid
  4. 13. The sympathetic and parasympathetic are part of the __ nervous system.
  5. 14. Ciliated ependymal cells move ___ fluid around so that it stays homogenous.
  6. 16. These cells insulate PNS axons.
Down
  1. 1. Form the blood-brain barrier.
  2. 2. Stimulus strong enough to produce an action potential.
  3. 3. Binds CNS neurons together and insulate the axons
  4. 4. Engage in phagocytosis to fight infections.
  5. 7. The ___ of the action potential sent to your brain is what determines the “intensity” of the stimulus.
  6. 8. Muscles and neurons are excitable cells, but__ are not.
  7. 9. This division of the ANS generally prepares the body for increased energy expenditure.
  8. 10. The resting potential inside of a neuron has a ___ charge.
  9. 12. Neurons in the ___ are covered by oligodendrocytes and these cannot regenerate.
  10. 15. Neurons from the __ have Schwann cells and can regenerate.