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cell damage
Cell damage can result in death of individual cells, tissue or organ failure and/or death of the organism. Harmful molecules are continually bombarding the human body, such as free radicals, by-products of energy production. These damage the proteins, fats and DNA that make up cells. When young, the body is able to repair most cellular damage. As it ages, the repair process becomes less efficient.
==Causes==
* Physical agents such as heat or radiation can damage a cell by literally cooking or coagulating their contents.
* Impaired nutrient supply, such as lack of oxygen or glucose, or impaired production of adenosine triphosphate (ATP) may deprive the cell of essential materials needed to survive.〔Klaassen, C.D., Ed.: Casarett and Doull's Toxicology: The Basic Science of Poisons. Sixth Edition, McGraw-Hill, 2007 ().〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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