NUTR 3070 Lecture Notes - Lecture 3: Calorimeter, Antoine Lavoisier, Calorimetry
22 Jan 2020
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Document Summary
Cellular source of energy = atp: sustains physical energy, anabolism, active transport, etc, cellular source of energy is supplied by the macronutrients in the diet. Energy value of food = calorie (cal) a measure of heat: 1 kcal = 4. 18 kj (kilojoules, 1 kcal = 1000 calories = 1 calorie. Calorie energy required to raise the temperature of 1 kg (1l) of water by 1 c. Weight gain/obesity infertility increased blood lipids insulin resistance. Antoine lavoisier: compared heat produced by a guinea pig with the production of co2. Ice calorimeter (heat produced by the amount of ice that melts: co2 formed from the reaction between oxygen and the organic matter. Potential errors: overestimates energy, we don"t digest food like a bomb calorimeter, doesn"t take into account the energy needed for digestion and absorption. Chemical basis of cho, fat, and protein influences the heat of combustion for macronutrients. Cho ratio of hydrogen to oxygen = 2. 1.
