| A | B |
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| Regulation | l Is the control and coordination of all life activities |
| Nervous System Involves 3 basic structures: | Nervous System Involves 3 basic structures: |
| Receptors | Are specialized structures that are sensitive to changes in the external and internal environment |
| Neurons | l The neuron is the basic unit of structure and function in the nervous system and are nerve cells |
| Effectors | l Are muscles or glands in which neurons are attached to the neuran |
| The Neuron | l Neurons are used for the transmission of impulses from one part of the body to another |
| 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 | know as tha body cell and containds the nucleors of the nutron |
| 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 |
| Receptor | receives the stimulus and initiates an impulse |
| 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 |
| Effector | is a muscle or gland |
| Hydra | l Contains no brain or control center, so impulses travel in all directions across a nerve net |
