NPB 101 Lecture Notes - Lecture 36: Skeletal Muscle, Calorie, Adipose Tissue

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1st law of thermodynamics states that energy can be neither created or destroyed. All energy used by cells of the body comes from ingested food. We do not change the rate of nutrient absorption depending on fuel reserves. External work = energy expended to move the body in relationship to the environment (e. g. exercise) Internal work = energy expending activities that must go on all the time to sustain life + skeletal muscle activity other than. Heat- only 50% of energy in food is transferred to atps. So only 25% of consumed energy is available for work. Metabolic rate - is the rate of energy use (due to internal work, external work, and heat) metabolic rate = energy expenditure/unit of time. When nutritionists refer to the amount of calories in food, they are actually referring to kilocalories or calories. Example: 4 kilocalories of heat are released when 1 g of glucose is oxidized ( burned )

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