| A | B |
|---|
| Vision | special sense controlled by the eye |
| Hearing | the special sense controlled by the ear |
| Smell | the special sense controlled by the nose |
| Taste | the special sense controlled by the tongue |
| Impulse | a force that produces sudden activity in nerve cells and is transmitted in a wave along nerve fibers |
| Internal | inside |
| External | outside |
| Organ | group of body tissues that perform a specific function |
| Stimuli | things that excite or activate a nerve and causes and impulse |
| Tissue | cells of the same type join to perform a common task |
| Choroid coat | middle layer of the eye |
| Retina | innermost layer of the eye; transmits impulses from light rays to the optic nerve |
| Cornea | clear, circular part at the front of the eye that allows light rays to enter |
| Refract | to bend |
| Cones | Nerve cells in the back of the eye that senses color and used mainly for vision in bright light |
| Rods | nerve cells in the back of the eye used for vision in dark or dim light |
| Skull | cranium and facial bones |
| Nasal Cavity | contains parts of the nose |
| Tympanic membrane | eardrum; separates outer ear from middle ear |
| Pharynx | throat |
| Cell | basic unit of structure in all plants and animals |
| Cerebellum | part of the brain responsible for coordination of muscle movements, balance, posture and muscle tone |
| Saliva | begins the chemical breakdown of food in the mouth |
| Inflammation | response to injury or illness characterized by swelling, redness, pain and heat |
| Bacteria | single-celled microorganism that causes disease |
| Virus | smallest microorganism causing disease |
| Infectious disease | disease that results from an invasion of microorganisms such as bacteria and viruses |
| Sclera | outermost layer of the eye (white of the eye) |
| Antibiotic | type of medicine used to fight infections from bacteria |
| Lens | clear, circular structure in the eye that focuses light rays to back of eye |
| Infection | disease in the body caused by germs and can spread to others |
| Contagious | disease that can be spread from person to person |
