Nervous System

1. protein responsible for neuron activity
4. organism with complex brain (millions of neurons)
7. brain and spinal chord; decision making
8. cell body of a neuron
10. fight or flight, responds to danger
12. have centralized ganglia (functions like primitive brain, small and no higher order thinking, emotions or logic)
15. branches that receive message
17. cleft space between cells
20. protein responsible for neuron activity
21. area between the terminal button and dendrite of another neuron

2. muscles and voluntary movement
3. organism with ganglion ( cell bodies of neurons) form decision making centers( not higher order thinking)
5. rest and digest
6. sends message to terminal button
9. these organisms have a collection of nerves
11. work through action
13. brain of the neuron
14. have a full complex brain with central and peripheral nervous system
16. involuntary, control organs and glands
18. composed of the somatic and autonomic systems
19. these organisms have a decentralized net of nerves