How Neurons Communicate

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Across
  1. 4. What is the symbol for sodium?
  2. 5. The long thread-like part of the neuron that the message is sent down.
  3. 6. A charged particle.
  4. 7. When a cell becomes more positive or less negative.
  5. 9. The structure that maintains the membrane gradient. Hint: The sodium potassium _______.
  6. 10. The chemical released to communicate with other neurons.
  7. 12. A tiny cell of the nervous system.
Down
  1. 1. A small electrical pulse by which neurons communicate.
  2. 2. The outer layer of a cell that allows particles in and out of the cell.
  3. 3. The type of ion that is more abundant inside the cell.
  4. 8. The tree-like extension of the neuron cell that receives the message.
  5. 11. The final end of the nerve cell that releases the electrical impulse.