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Deployment cost–benefit selection in physiology concerns the costs and benefits of physiological process that can be deployed and selected in regard to whether they will increase or not an animal’s survival and biological fitness. Variably deployable physiological processes relate mostly to processes that defend or clear infections as these are optional while also having high costs and circumstance linked benefits. They include immune system responses, fever, antioxidants and the plasma level of iron. Notable determining factors are life history stage, and resource availability. ==Immunity== Activating the immune system has the present and future benefit of clearing infections, but it is also both expensive in regard to present high metabolic energy consumption, and in the risk of resulting in a future immune related disorder. Therefore, an adaptive advantage exists if an animal can control its deployment in regard to actuary-like evaluations of future benefits and costs as to its biological fitness. In many circumstances, such trade-off calculations explain why immune responses are suppressed and infections are tolerated. Circumstances where immunity is not activated due to lack of an actuarial benefit include: * Malnutrition * Old age * Hibernation * Parasitism (low or high risk) * Sexually transmitted diseases (low or high risk) * Light patterns associated with winter (probable resource shortage) 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Deployment cost–benefit selection in physiology」の詳細全文を読む スポンサード リンク
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