| A | B |
|---|
| Regulation | the control and coordination of all life activities |
| Receptors | Specialized structures that are sensitive to changes in the external and internal environment |
| Impulses | electrochemical message |
| Effector | muscles or glands in which neurons are attached to |
| Stimulus | a change in the external or internal environment, which initiates an impulse |
| Neuron | nerve cells |
| Cyton | Known as the body cell. Contains the nuleus of the neurons. |
| Dendrites | Fibers that detect stimuli and generate an impulse toward the cyton |
| Axon | A fiber that transmits the impulse away from the cyton and towards the terminal branch |
| Synapse | The gap between the terminal branches of 1 neuron and the dendrites of another neuron |
| Sensory Neurons | carry impulses from the receptor toward the spinal cord and brain |
| Motor Neurons | carry impulses from brain and spinal cord toward the effectors |
| Interneurons | relay impulses from one neuron to another |
| Nerves | a bundle of axons that are bound together by connective tissue |
| Sensory Nerve | a nerve containing the axons of sensory neurons only |
| Motor Nerve | a nerve containing the axons of motor neurons only |
| Neurotransmitters | chemials secreted by terminal branches that aid in the transmission of an impulse across the synapse |
