Nervous System

5. a gap in the myelin sheath of a nerve
8. associated with control over skeletal muscles
13. receive signals that trigger an electrical signal, by regulating the activity of ion channels
14. enabling communication between sensory or motor neurons and the central nervous system
19. conduct impulses toward or away from the central nervous mechanism
20. a junction between two nerve cells, consisting of a minute gap across which impulses pass by diffusion of a neurotransmitter
22. membrane that receives a signal from the presynaptic cell
24. motor neuron
25. insulates axon

1. a sensory receptor which receives stimuli from within the body
2. sensory neurons that carry nerve impulses from sensory stimuli towards the central nervous system and brain
3. endings of the axon
4. contains nucleus
6. the body's chemical messengers and causes the transfer of the impulse to another structure
7. large granular body found in neurons
9. branch off of the axon
10. Nervous system that acts unconsciously to regulate body functions
11. detect a change in the environment
12. nervous system that includes the brain and spinal cord
15. cells of the peripheral nervous system that help form the myelin sheath around the nerve fibers
16. nervous system that carries information between sensory organs to the CNS
17. specialized area of membrane of the axon terminal that faces the plasma membrane of the neuron or muscle fiber with which the axon terminal establishes a synaptic junction
18. carries nerve impulses away from the cell body
21. nerve cell
23. structure containing a number of nerve cell bodies