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Across 1. The chemical compounds that are released from the axon terminal into the synapse 8. The part of the nervous system that includes the brain and the spinal cord (3 Words) 11. The major ion located outside the axon. Hint: its chemical symbol is Na 14. What happens when too many potassium (K) ions rush out of the axon 17. A specialised cell of the nervous system 19. The part of the nervous system that includes the nerves and individual nerve fibres (3 Words) 21. The end of the axon where neurotransmitters are stored (2 Words) 22. The name of the cell body 23. The ion which enters the axon when the axon potential is conducted along the axon

Down 2. The potential, or the difference in charge across the plasma membrane of a neuron (or any other cell) under resting conditions (3 Words) 3. The singular projection from the cell body (soma) which conducts action potentials 4. A group of nerve fibres 5. The resting charge of the inside of the neuron (or any other cell) 6. The tiny space between the axon terminal and the cell that it is innervating (a muscle cell, a gland cell or another neuron) 7. The resting charge of the outside of the neuron (or any other cell) 9. The major ion located inside the axon. Hint: its chemical symbol is K 10. What happens to the resting membrane potential when the potassium (K) ions rush out of the axon. Hint: this is the second part of the action potential 12. The electrical signal that is conducted down the axon from cell body (soma) to the axon terminal (2 Words) 13. What happens to the resting membrane potential when an action potential passes down the axon (ends in -ation). Hint: this is when the sodium (Na) ions rush into the axon 15. The process by which vesicles of neurotransmitters are released by the axon terminal when the axon potential arrives 16. The minimum change in resting membrane potential needed for an action potential to be propagated down an axon 18. Projections from the cell body (soma) which receive action potentials and send this information to the cell body (soma) 19. The ion which exits the axon when the axon potential is conducted along the axon 20. The chemical compound that rushes into the axon terminal when the action potential arrives. Hint: its chemical symbol is Ca