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| O2 |
symbol of the chemical element oxygen. |
| oxide |
a compound that includes oxygen. |
| oxidize |
to combine with oxygen. [1/2 definitions] |
| oxygen |
a gas with no color or smell that is one of the chemical elements. Oxygen combines with hydrogen to make water. It also makes up about twenty percent of the earth's atmosphere. Most living things need oxygen. (symbol: O) |
| ozone |
a form of oxygen that occurs when oxygen is exposed to an electrical charge, like lightning. It is found naturally in Earth's atmosphere. |
| protein |
a substance that is made up of nitrogen, carbon, oxygen, hydrogen, and possibly other elements. Proteins are found in all living things and are a necessary part of life processes. |
| red blood cell |
a cell in the blood that carries oxygen to the body's tissues. |
| respiratory system |
the system that brings oxygen to the body. It is made up of the lungs, diaphragm, windpipe, and nasal passages. |
| scuba diving |
Scuba diving is the activity or sport of swimming while wearing special equipment that lets you breathe while you are completely under the water. The equipment includes a tank filled with oxygen. |
| shock1 |
Shock is a dangerous condition of the body. When someone goes into shock, their body becomes completely weak and close to death. Blood is not flowing through the body the way it should and cells are not getting the oxygen that they need. [1/6 definitions] |
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