| A | B |
|---|
| Nueron | Basic unit of structure and function in the nervous system |
| Effectors | muscles or glands in which nuerons are attatched to |
| Receptors | Specialize structures that are sensitive to changes in the external and internal environment |
| Impulse | electrochemical message |
| Stimulus | is a change in the external or internal environment which initiates an impulse |
| What are 3 basic structures in the nervous system? | 1. Receptors 2. Nuerons 3. Effectors |
| Regulation | Is the contorl and coordination of all life activities |
| Dendrites | Fibers that detect stimuli and generate an impulse towar the cyton |
| Cyton | Known as the cell body and contains the nucleus of the nueron |
| 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. |
| Nuerotransmitters | l Chemicals secreted by the terminal branches that aid in the transmission of an impulse across the synapse |
| Sensory neuron | carry impulses from the receptors toward the spinal cord and brain |
| Interneuron | relay impulses from one neuron to another |
| Motor neuron | carry impulses from brain and spinal cord toward the effectors |
| Hydra | l Contains no brain or control center, so impulses travel in all directions across a nerve net |
