| A | B |
|---|
| medicines | drugs |
| stimulus | stimuli |
| stimuli | stimulus |
| central nervous system | brain and spine |
| nerves | nerve cells |
| brain | thinking |
| spinal cord | back bone |
| nerve cell | has neurons |
| neuron | nerve cell |
| impulses | synapse |
| dendrite | on cell body |
| axon | tube on cell body |
| pulses | heartbeat |
| synapse | impulses |
| reflex | instant action |
| voluntary responses | controlled action |
| involuntary responses | reflex |
| brain stem | connected to brain |
| cerebellum | on brain |
| cerebrum | on brain |
| organ | vital body part |
| receptor cells | captures nerve impulses |
| focal point | where image appears in eye |
| retina | inner part of eye |
| cornea | outer layer of eye |
| pupil | lets light into eye |
| outer ear | we refer to it as the ear |
| inner ear | part of ear we can't see with out equipment |
| middle ear | has ear drum in it |
| canal | tube in ear |
| eardrum | part of ear that sends signals to the brain |
| cochlea | looks like a snail |
| semicircular canals | makes up the inner ear |
| nostril | nasal passage is inside it |
| taste buds | the receptors on the tounge |
| nasal passage | inside the nostrils |
| mucus | inside the nasal passage |
| drug | something that can be abused |
| caffeine | energy booster |
| drug abuse | deadly way to use drugs |
