Author or Editor: Ira Wolinsky and Judy A. Driskell
Publisher: Taylor & Francis Group, LLC
Published: 2008
Pages: 272
The human system, like the systems of most other taxa, has devised mechanisms to store energy. This storage frees the body from the demands of continuously adding energy to the system. Macronutrients in foods contain energy-rich chemical bonds. After digestion and absorption, the energy is stored as chemical bonds in triglyceride (fat), in glycogen (carbohydrate) and, arguably, in skeletal muscle (protein). This stored chemical bond energy is what is used to perform work. In this sense, human energy metabolism is similar to an internal combustion engine wherein energy substrates enter (food or gasoline), are combusted, and heat and work are produced. Metabolic energy is quantified in units of kilocalories (kcal, 1000 calories) and kilojoules (kJ, 1000 joules) or megajoules (MJ, 1000 kJ).
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