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Chapter_41_to_post - Chapter 41 Nutrition and Digestion A nutritionally adequate animal diet satisfies three needs Fuel(chemical energy Organic raw

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Unformatted text preview: Chapter 41 Nutrition and Digestion A nutritionally adequate animal diet satisfies three needs: Fuel (chemical energy) Organic raw materials for biosynthesis (especially carbon-based molecules) Essential nutrients (substances that the animal needs, but cannot synthesize from any precursors on its own) A nutritionally inadequate animal diet fails to satisfy the three basic needs we just covered Undernourishment – insufficient calories (energy) Overnourishment – too many calories & too much stored fat Malnourishment – a diet missing one or more essential nutrients Energy Energy in nutrients is measured in Calories (kcal = energy to raise the temperature of 1 L of water 1º C) An “average” human body uses about 1,550 Calories/day Principal categories of nutrients: Lipids – found in lipid membranes, etc .; including essential fatty acids 9 Calories per gram (a principal energy source) Principal categories of nutrients: Proteins – building blocks and enzymes; animals require 20 amino acids, including essential amino acids 4 Calories per gram (usually a secondary energy source, since the breakdown of proteins produces urea, a potentially toxic compound) Principal categories of nutrients: Proteins – building blocks and enzymes; animals require 20 amino acids, including essential amino acids Fig 41.2 Principal categories of nutrients: Carbohydrates – C-based building blocks and energy 4 Calories per gram; can be a very quick energy source ( e.g ., glucose) Principal categories of nutrients: Vitamins – essential organic molecules required in small quantities Know this info for the exam! Principal categories of nutrients: Minerals – essential elements and inorganic molecules (similar to mineral macro- and micro-nutrients required by plants, but also including selenium, iodine, etc .) Know this info for the exam!Know this info for the exam!...
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This note was uploaded on 05/13/2010 for the course BIOL 1202 taught by Professor Gregg during the Spring '08 term at LSU.

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Chapter_41_to_post - Chapter 41 Nutrition and Digestion A nutritionally adequate animal diet satisfies three needs Fuel(chemical energy Organic raw

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