physiology - What is the human energy consumption by organ?

The human brain uses about 25% of the human body's metabolic energy. How are the other 75% spent, in terms of portioning to its various systems?

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Answer

Percent of basal metabolic rate by organ (BC Campus Open Education):

• Liver and spleen : 27%


• Brain: 19%


• Skeletal muscle: 18%


• Kidneys: 10%


• Heart: 7%


• Other tissues (lungs, intestine, skin, bone, fat tissue, glands...): 19%

Basal metabolic rate by 1 kg of specific organ tissue (kcal/kg of organ/day) (Table 5 from American Journal of Clinical Nutrition, 2010):

• Heart: 440 kcal/kg


• Kidneys: 440 kcal/kg


• Brain: 240 kcal/kg


• Liver: 200 kcal/kg


• Skeletal muscle: 13 kcal/kg


• Adipose tissue: 4.5 kcal/kg


• Residual tissues (lungs, intestine, skin, bone...): 12 kcal/kg