| A | B |
|---|
| Dendrite | Branches that extend out of the cell body; where impulses enter |
| Cell Body | Largest part of a neuron |
| Axon | *long fiber that carries impulses away from the cell body of a neuron |
| Axon Terminal | *small swelling in a neuron at the end of an axon |
| Sensory Neuron | neuron that carries impulses from the sense organs to the brain and spinal cord |
| Motor Neuron | neuron that carries impulses from the brain and spinal cord to muscles and glands |
| Interneuron | Neurons located in the brain and spinal cord. |
| Nerve Impulse | Action potential travelling along a membrane; a wave of depolarization and repolarization that passes along the neuron. |
| Neurotransmitters | Chemicals released into synapses that transfer an impulse from one neuron to the next. |
| Myelin | coating on the axons that serves as an insulator |
| Synapse | Places where neurons connect (gap betwen the 2 neurons) |
| Threshold | minimum level of stimulus required to activate a neuron |
| Neurotoxin | Toxins, such as opium and alchohol, that interfere witht he transmission of impulses |
| Nervous System | system that recieves and relays info about activities within the body and monitors and responds to internal and external changes |
| Neuron | Nerve cells that carry impulses and are the basic unit of the nervous system |
| Peripheral Nervous System (PNS) | Composed of Sensory and Motor Neurons |
| Central Nervous System (CNS) | Composed of Interneurons in the Brain and Spinal Cord |
