Nervous System Introduction

1. This potential has no threshold or refractory period.
4. 31 pairs make up the ________ nerves.
6. The meeting point between a neuron and any other cell.
9. These neurons convey information from the tissues and organs of the body toward the CNS.
11. GABA, glutamate and glycine are examples of what type of neurotransmitter?
12. The __________ nervous system consists of all the nervous system except the brain and spinal cord.
13. Dopamine, norepinephrine and epinephrine are examples of what?
16. Cells Line the fluid-filled cavities within the brain and spinal cord, regulating the production and flow of cerebrospinal fluid.
18. This type of glial cell makes up over 90% of the tissue in some areas of the brain.
19. _________ is a knot like swelling in a nerve where the cell bodies of neurons are concentrated.

2. Unbound neurotransmitters are actively transported back into the presynaptic axon terminal for reuse.
3. What is "a" identifying in this image?
5. A 10 to 20 nm extracellular space that separates the presynaptic and postsynaptic neurons.
7. The ___________ potential is the voltage difference between the inside and outside of a cell.
8. A __________ refers to a reversal of the membrane potential polarity -- when the inside of a cell becomes positive relative to the outside.
9. The first neurotransmitter identified.
10. Neurotransmitters that act through second messengers.
14. What synaptic process is this image displaying?
15. The majority of nervous tissue is composed of what cell type?
17. This type of potential depends on voltage-gated ion channels.