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07 February 2025
 
  » pubmed » pmid3975638

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Digestive adaptations for fueling the cost of endothermy
W H Karasov ; J M Diamond ;
Date 12 Apr 1985
Journal Science, 228 (4696), 202-4
AbstractLittle is known about the digestive adaptations that enable mammals to sustain metabolic rates an order of magnitude higher than those of reptiles. Comparison of several features of digestion in mammals and lizards of similar size eating the same diet revealed that mammals processed food ten times faster and with the same or greater extraction efficiency. Transport kinetics and rates of nutrient absorption normalized to the quantity of intestinal tissue were similar in these two classes of vertebrates. The main basis for faster absorption in mammals is their much greater intestinal surface area.
Source PubMed, pmid3975638
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