Oxygen


is required for the release of energy from food molecules (aerobic respiration). Instead of breaking down food molecules completely, muscle cells switch to a form of partial breakdown that does not require (anaerobic respiration) so that they can continue to generate energy. This partial breakdown produces lactic acid, which results in a sensation of fatigue when it reaches certain levels in the muscles and the blood. Once the vigorous muscle movements cease, the body breaks down the lactic acid, using up extra to do so. Panting after exercise is an automatic mechanism to 'pay off' the debt.
Lactic acid or CH3CHOHCOOH organic acid, a colorless, almost odorless liquid, produced by ...

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the means by which animals derive the energy needed to sustain life. Furthermore, is the most abundant element at the surface of the Earth. In combined form it is found in ores, earth’s, rocks, and gemstones, as well as in all living organisms.
is a gaseous chemical element in Group VA of the periodic table. The chemical symbol for atomic is O, its atomic number is 8, and its atomic weight is 15.9994. Elemental is known principally in the gaseous form as the diatomic molecule, which makes up 20.95% of the volume of dry air. Diatomic is colorless, odorless, and tasteless.
Two 18th-century scientists share the credit for first isolating elemental : Joseph PRIESTLEY (1733-1804), an English clergyman who was employed as a literary companion to Lord Shelburne at the time of his most significant experimental work, and Carl Wilhelm SCHEELE (1742-86), a Swedish pharmacist and chemist. It is generally believed that Scheele was the first to isolate , but that Priestley, who ...

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a gamma ray and an alpha particle. In helium-burning stars the isotope of carbon with mass 12 is thought to capture an alpha particle to form the isotope with mass 16 with the emission of a gamma ray.
In the terrestrial environment oxygen accounts for about half of the mass of the Earth's crust, 89% of the mass of the oceans, and 23% of the mass (and 21% of the volume) of the atmosphere. Most of the Earth's rocks and soils are principally silicates. The silicates are an amazingly complex group of materials that typically consist of greater than 50 (atomic) percent oxygen in combination with silicon and one or more metallic elements.
Several important ores are principally oxides ...

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Added: 1/16/2005 08:50:52 PM
Category: Science & Nature
Type: Premium Paper
Words: 2741
Pages: 10

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