The living cells of the body produce (metabolize) energy from the chemicals absorbed from food during digestion and oxygen absorbed by the lungs in a complex series of relatively inefficient chemical reactions. Only about 20% of the energy produced is used to perform work, and the remaining 80% is converted to heat. Accordingly, metabolism is measured in units of heat called Calories or kilogram calories (1 Calorie = 1,000 calories). A Calorie is the amount of heat needed to raise the temperature of 1 kilogram of water 1{\textdegree}C.
CITATION STYLE
Thompson, J. G. (1988). The Thermoregulatory System. In The Psychobiology of Emotions (pp. 93–119). Springer US. https://doi.org/10.1007/978-1-4899-2121-5_5
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