Health Test 3
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23 terms
Terms | Definitions |
|---|---|
 immunity | body's ability to resist a particular disease |
| pathogens | bacteria and viruses that cause diseases |
| skin | largest organ of the body |
| mucous membranes | special skin cells that line the mouth, nose and throat |
| cilia | hairlike projections that line the mucous membrane |
| hydrochloric acid | the chemical that destroys most harmful bacteria that enter the stomach |
| lysozyme | the enzyme that kills bacteria in your tears and perspiration |
| spleen | largest lymphatic organ |
| lymph vessels | transportation tubes for lymph |
| lymph nodes | enlarged bunches of lymphatic tissue |
| lymphocytes | white blood cells found in the lymph nodes |
| cerebrum | largest part of the brain; controls thinking, reasoning and logic |
| central nervous system | consists of the brain and spinal cord |
| Olfactory receptors | send messages to the brain which allow you to smell |
| nerves | the "wires" of your communication system |
| auditory canal | allows sound waves to travel from the outer ear to the eardrum |
| auditory nerve | allows messages to be carried to the brain causing you to hear |
| sclera | tough outer layer of the eye |
| iris | the colored part of the eye |
| pupil | the center of the iris that allows light to pass |
| lens | becomes thicker when you view things closely and thicker when you view things far |
| eye socket | the protective hollow space in your skull that surrounds the eye |
| optometrist | person trained to examine eyes and prescribe glasses |
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