Abstract
The small intestine exhibits unusual features with respect to tissue energy metabolism. First, it is the major portal of entry of energy-providing nutrients of carnivorous and omnivorous animals. The fact that in omnivorous and carnivorous animals large quantities of energy-yielding nutrients are absorbed relative to the actual requirements of the absorbing tissue has implications with respect to the segregation of these nutrients from the cellular metabolism of the intestine. For an adult human with an intake of 2,500 kcal (10.5 MJ) per day and equivalent to 9 × 105 kcal (3.8 GJ) a year, it has been calculated that the requirements of the intestinal mucosa are not more than about 450 kJ per day (164 M J per year) (Parsons 1975). The energy requirements of the mucosa are therefore probably less than 5% of the energetic value of the nutrients handled by the tissue during digestion and absorption.KeywordsSmall IntestineBrush BorderIntestinal LumenBrush Border MembraneElectrochemical GradientThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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