| A | B |
|---|
| Regulation | Is the control and coordination of all life activities |
| Receptors | Are specialized structures that are sensitive to changes in the external and internal environment |
| Neurons | The neuron is the basic unit of structure and function in the nervous system |
| Effectors | Are muscles or glands in which neurons are attached to |
| Impulse | electrochemical message |
| Stimulus | is a change in the external or internal environment which initiates an impulse. Ex: hot stove |
| Receptors | structures that are specialized to detect stimuli |
| Dendrites | l Fibers that detect stimuli and generate an impulse toward the cyton |
| Cyton | Known as the cell body, contains the nucleus of the neuron |
| Axon | l A fiber that transmits the impulse away from the cyton and towards the terminal branches |
| Terminal Branches | l The ends of axons that secrete neurotransmitters |
| Synapse | l The gap between the terminal branches of 1 neuron and the dendrites of another neuron. |
| Neurotransmitters | l Chemicals secreted by the terminal branches that aid in the transmission of an impulse across the synapse |
| Hydra | Contains no brain or control center, so impulses travel in all directions across a nerve net |
