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| | metabolism. The Columbia Encyclopedia, Sixth Edition. 2001-05 |
 | | Two subcategories of metabolism are anabolism, the building up of complex organic molecules from simpler precursors, and catabolism, the breakdown of complex substances into simpler molecules, often accompanied by the release of energy. |
 | | The basal metabolism rate is usually measured indirectly by calculation from measurements of the amounts of oxygen and carbon dioxide exchanged during breathing under certain standard conditions, i.e., complete rest in a room temperature of 68°F (20°C), 12 to 14 hours after ingestion of food. |
 | | A less cumbersome method of estimating basal metabolic rate involves the quantitative assay of the hormone thyroxine, known to regulate the bodys rate of metabolism. |
| www.bartleby.com /65/me/metabolism.html (292 words) |
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