neurotransmission

2. controls involuntary responses
4. CNS to muscle gland neurons
7. hormone responsible for our happiness
9. the gap between the axon terminal and dendrites of two neurons
11. controls voluntary movements
12. the direction which the the nerve impulse travels
13. receives and processes sensory information
16. conducts signals to and from the brain
19. sensory organs to CNS neurons
20. a fatty, insulating cover around the axon which protects the neuron and speeds up impulses

1. appear on the surface of the postsynaptic membrane and fits neurotransmitters in a lock and key
3. the end of the axon which the neurotransmitters leave from
5. a cell which is found in the brain and nervous system
6. fight or flight
8. chemicals which travel across the synapse to the receptors of the next neuron
10. rest or digest
14. where the electrical impulse passes along
15. link the two other neurons
17. electrical signal that is sent down the axon length
18. the start of a neuron which receives the neurotransmitters