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signals of bioenergetics, caloric power of the alimony
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original language The energy used from the man in order to remain while still alive is supplied from the alimony and from the breathed oxygen, through which, it is possible estrarla from the same alimony. The energy is indispensable in order to concur all a series of phenomena that allow the life: cellular integrity, expulsion of refusal substances, synthesis of the useful substances, muscular and mental job, corporea termoregolazione etc
How much task with the meal comes degraded from the organism in substances smaller, and simpler, during the digestive process. The constituent ones of the alimony are then employ to you like plastic material; as energetic source of ready I use or to store; or like refusal substances that then come escrete.
The determination of the caloric power of the alimony (expressed in Calorie or Kilocalorie) is measured for means of the bomb calorimetry, constituted from an isolated room in which it comes inserted the substance to estimate and oxygen for its combustion. Fact comes to oxidize the content until to its reduction in substances to minor energetic level and measure the heat liberation that achieves some.
In the organism, with the exception of how much it happens in the calorimetrica bomb, all the principles nourished are not completely oxidizes to you in fact, while in the calorimetrica bomb all the nitrogen is reduced to ammonia (from which it is not more possible to extract energy), in the organism it comes transformed in urea and other substances from which it is possible to obtain (seppur in small measure) ulterior energy.
Moreover, part of the ingested alimony, comes expelled with made them before a its complete absorption (feeds to low coefficient of digeribilità). It achieves some that, the caloric power in the organism, is inferior regarding that noticeable one experimentally. Such difference is particularly wide in proteins, just for the important quota the nitrogenized part, than in the organism it is excretes without I use to energetic scope. In the detail, every nourishing, expresses the following caloric quotas:
| Principles nourished to you |
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In the calorimetrica bomb |
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In the organism |
| Glucidi |
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4.1 Calorie/g |
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4 Calorie/g |
| Lipids |
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9,3 Calorie/g |
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9 Calorie/g |
| Protidi |
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5,6 Calorie/g |
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4 Calorie/g |
It becomes indispensable, to this point, to define the term Kilocaloria (Kcal). The Kcal expresses the amount of heat necessary in order to raise of the 1 °C temperature of a Kg of water, and exactly in order to carry its temperature from 14,5 to 15,5 °C.
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