| A | B |
|---|
| basic cell of the nervous system | neuron |
| long projection of a neuron that sends messages | axon |
| shorter branches of a neuron that receive messages | dendrites |
| a bundle of neurons | nerve |
| voltage difference between the inside and outside of a neuron | resting potential |
| brief reversal of a resting potential | action potential |
| the amount of time it takes for a neuron to restore a resting potential | refractory period |
| fatty substance that insulates a neuron | myelin |
| gap in the myelin surrounding a neuron | node |
| gap between two neurons | synapse |
| chemicals that diffuse across synapses | neurotransmitters |
| dopamine, serotonin and acetylcholine are examples | neurotransmitters |
| neurons that connect sense organs to the CNS | sensory neurons |
| neurons that connect the CNS to muscles | motor neurons |
| neurotransmitters bind to these | receptors |
