Anat/Phys Chapter 1 Lesson 2
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Created by:
122brunolick on September 25, 2011
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About the body and food.
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11 terms
Terms | Definitions |
|---|---|
 Neurons | Building blocks of the brain; cells that carry impulses throughout the nervous system. |
| Impulse | Electrical signal or message carried by neurons in the nervous system. |
| Cell body | Largest part of the neuron in which metabolic activity takes place. |
| Dendrite | Any of many small branched extensions of the cell body of a neuron that store memories and carry impulses toward the cell body. |
| Axon | Single, long, branched extension of the cell body of a neuron that carries impulses away from the cell body. |
| Resting Potential | The product of a net excess of negative changes on the inside of the membrane. |
| Action Potential | Rapid change in voltage on the inside of the axon from negative to positive and then back to negative. |
| Schwann cells | A chain of supporting cells enclosing the axons of many neurons |
| Myelin Sheath | Material that forms a protective sheath around an axon; white fatty substance that surronds many vertabrae nerve cells. |
| Nodes | Gaps formed by the Schwann cells on an axon. |
| Neorotransmitter | A chemical used by one neuron to signal another cell. |
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