| A | B |
|---|
| receptors | specialized structures that are sensitiveto changes in the external and internal environment |
| regulation | the control and coordination of all life functions |
| effectors | muscles or glands in which neurons are attached to |
| neurons | nerve cells; basic unit of structure and function in the nervous system |
| impulse | electrochemical message |
| stimulus | a change in the external or internal environment which initiates an impulse |
| cyton | known as the cell body; contains the nucleus of the neuron |
| dendrites | nd generate an impulse toward the cyton |
| terminal branches | the ends of axons that secrete neurotransmitters |
| axon | a fiber that transmitsthe impulse away from the cyton and towards the terminal branches |
| synapse | the gap between the terminal branches of one neuron and the dendrites of another neuron |
| neurotransmitters | chemicals secreted by the terminal branches that aid in the transmission of an impulse across the synapse |
| motor neuron | carry impulses from the brain and spinal cord towards the effectors |
| sensory neuron | carry impulses from the receptors toward the spinal cord and brain |
| interneuron | relays impulses from one nueron to another. located in the spinal cord |
| nerves | make up the nervous system |
| sensory nerves | aids in the travel impulse towards the brain |
| motor nerves | aids in the travel impulse from the brain |
