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science 7 final 2012
vocabulary
| Question | Answer |
|---|---|
| tendons | strands of tough connective tissues that connect your skeletal muscles to bones. |
| ligaments | strong elastic bands of connective tissue that connect joints. |
| flexor | a muscle that bends part of your body. |
| extensor | a muscle that straightens part of your body. |
| melanin | the chemical that determines your skin color. |
| emphysema | a respiratory disease where the alveoli have been damaged. |
| gastric ulcer | when the stomach acid eats through the stomach lining. |
| homeostatis | the maintance of a stable internal environment. |
| epithelial tissue | covers and protects underlying tissue. |
| nervous tissue | sends electrical signals throught the body found in the brain, nerves, and sense organs. |
| muscle tissue | made of cells that contract and relax to produce movement. |
| connective tissue | joins, supports, protects, insulates, nourishes, and cushions organs. Keeps organs from falling apart. |
| epidermis | the outermost layer of the skin. |
| dermis | the layer below the epidermis |
| plasma | fluid part of the blood. |
| antibodies | chemicals that identify of destroy pathogens |
| hemoglobin | oxygen carrying protein gives RBC's their red color. |
| antigens | chemicals that are on the surface of your RBC's |
| alveoli | the tiny air sacs of the lungs where oxygen and carbon dioxide are exchanged |
| respiration | the exchange oxygen and carbon dioxide between living cells and their environment |
| lymph nodes | an organ that filters lymph and that is found along the lymphatic vessels |
| chyme | a soupy mixture that is the product of the stomach |
| villi | finger like projections that absorb nutrients |
| urea | one of the most important substances removed by nephrons, which contains nitrogen and is formed when cells use protein for energy |
| enzymes | substances that break some nutrients into smaller particles that the body can use |
| mechanical digestion | the breaking, crushing, or mashing of food. |
| chemical digestion | when large molecules are broken down into nutrients. |
| nephron | the unit in the kidney that filters blood. |
| aerobic exercises | moderately intense activities that can increase muscle strenghth but mostly strangthens the heart and increase indurance. |
| resistance exercises | a way to strengthen skeletal muscles. people work against the resistance or weight of an object. |
| nutrient | substances that provide the materials needed for life processes. |
Created by:
th550
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