| A | B |
|---|
| Regulation | The control and coordination in all life activites |
| Receptors | Specialized structures that are sensitive to changes in the external and internal environment |
| Neurons | nerve cells that are the basic unit of structure in the nervous system |
| Effectors | muscles or glands in which neurons are attracted to |
| Impulse | electrochemical message |
| Stimulus | a change in the external or internal environment which initiates an impulse |
| Receptors | structures that are specialized to detect stimuli |
| Dendrites | fibers that detect stimuli and generate an impulse toward the cyton |
| What contains no brain or control center, so impulses travel in all directions across a nerve net | hydra |
| The gap between the terminal branches of 1 neuron and the dentrites of another neuron | synapse |
| Terminal Branches | the ends of axons that secrete neurotransmitters |
| Cyton | known as the cell body |
| Receptors, Neurons, and Effectors are 3 basic structures of what? | nervous system |
| neurotransmitters | 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 |
| carry impulses from brain and spinal cord toward the effectors | Motor neuron |
| relay impulses from one neuron to another | Interneuron |
| What do receptors detect? | stimuli |
| Neurons are used for the transmission of what? from one part of the body to another | impulses |
| hydra contain no what? | brain or control center |
