| A | B |
|---|
| Stimulus | Detected by a receptor |
| Receptor | Detects a stimulus |
| Neurone | Proper word for a nerve cell |
| Impulse | Electrical signal carried by a neurone |
| Transduce | Change one form of energy into another |
| Taste buds | Detect chemical |
| Eyes | Detect light |
| Ears | Detect sound |
| CNS | Where sensory signals are processed |
| Effector | Muscle or glands |
| Response | What an effector 'does' |
| Focus light | What the cornea and lens do |
| Cornea and lens | Transparent parts of the eye which focus light |
| Iris | Muscle which controls size of pupil |
| Pupil | Hole which lets light into the eye |
| Cone | Detects the colour of light |
| Rod | Detects light and dark |
| Fovea | Where cones are most concentrated |
| Optic nerve | Carries nerve impulses from the retina |
| Blind spot | Hole in the retina which the nerves pass through to the optic nerve |
| Close to you | Where objects are if the lens is very fat |
| Far away | Where objects are if the lens is very thin |
| Muscle | What the iris is made of |
| Sensory neurone | Takes impulses from a receptor to the CNS |
| Motor neurone | Takes impulses from the CNS to muscles or glands |
| Reflex | An automatic (involuntary) response to a stimulus |
| Reflex arc | The pathway of nervous impulses that make a reflex happen |
| Rapid response | The reason reflexes protect the body so well |
| Spinal cord | The part of the CNS which isn't the brain |
| Conscious thought | Not involved in a reflex |
| Fatty sheath | Surrounds the axon of a nerve cell to make it faster |
| Fat | What the sheath round an axon is made of. It electrically insulates it. |
| Axon | The long part of a motor neurone which carries impulses. |
| Middle | Where the cell body is in a sensory neurone |
| Synapse | A nerve cell junction |
| Chemicals | What carries messages across the gap (synapse) between neurones |
| Drugs | Change the way synapses work, by blocking or exciting them |
| Alcohol | Legal drug that slows synapses down |
| Nicotine | Legal drug that stimulates synapses (makes them work too fast |
| Solvent | Messes up synapses, found in glue. Abuse of it regularly kills people even on their first go. |
