The Digestive Syste3

The Digestive Syste3 - • In the postabsorptive state...

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The Digestive System Lipid Metabolism Lipids are broken down in adipose tissue, and fatty acids are released into the blood. Fatty acids are taken up by cells and broken down into acetyl-CoA, which can enter the citric acid cycle. Acetyl-CoA can also be converted into ketones by the liver. Ketones released from the liver into the blood are used as energy sources by other cells. Protein Metabolism Amino acids are used to synthesize proteins. Amino acids can be used for energy, and ammonia is produced as a by-product. o Ammonia is converted to urea and excreted by the kidneys. Metabolic States In the absorptive state, nutrients are used as energy or stored.
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Unformatted text preview: • In the postabsorptive state, stored nutrients are used for energy. Metabolic Rate • Metabolic rate is the total energy expenditure per unit of time. • Metabolic energy is used for basal metabolism, muscular activity, and the assimilation of food. Body Temperature Regulation • Body temperature is a balance between heat gain and heat loss. • Heat is produced through metabolism. • Heat is exchanged through radiation, conduction, convection, and evaporation. • The greater the temperature difference, the greater the rate of heat exchange. • Body temperature is regulated at a "set point" by neural circuits in the hypothalamus. •...
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