| A | B |
|---|
| Regulation | Is the control and coordination of all life activities |
| nervous system invovles 3 basic structures, they are: | receptors, neutrons, effectors. |
| receptors | are specialized structures that are sensitive to changes in the external and internal environment |
| neurons | are nerve cells |
| what is the basic unit of structure and function in the nervous system? | Neurons |
| Effectors | are muscles or glands in which neurons are attached to |
| l Neurons are used for the transmission of impulses from one part of the body to another | true or false? |
| 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 | Fibers that detect stimuli and generate an impulse toward the cyton |
| name 2 things about the cyton | Known as the cell body and it contains the nucleus of the neuron |
| axon | A fiber that transmits the impulse away from the cyton and towards the terminal branches |
| Terminal Branches | The ends of axons that secrete neurotransmitters |
| synapse | The gap between the terminal branches of 1 neuron and the dendrites of another neuron. |
| Neurotransmitters | Chemicals secreted by the terminal branches that aid in the transmission of an impulse across the synapse |
| what does the receptor recieve? | receives the stimulus and initiates an impulse |
| what does the sensory neuron do? | carry impulses from the receptors toward the spinal cord and brain |
| what does the Interneuron do? | relay impulses from one neuron to another |
| what does the motor neuron do? | carry impulses from brain and spinal cord toward the effectors |
| is the effector a muscle or gland? | both |
| Hydra | l Contains no brain or control center, so impulses travel in all directions across a nerve net |
