Ch. 15 Nutrition  Metabolism

Ch. 15 Nutrition Metabolism PowerPoint PPT Presentation


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Ch. 15 Nutrition Metabolism

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1. Ch. 15 Nutrition & Metabolism Definitions Nutrition – food, vitamins and minerals that are ingested and assimilated in the body Metabolism – process of using food molecules as energy sources and as building blocks for our own molecules Catabolism – breaks food molecules down releasing, stored energy; O2 used. Anabolism – builds food molecules into complex substances

2. Ch. 15 Nutrition & Metabolism Role of the Liver Processes blood immediately after it leaves the G.I. tract Helps maintain normal blood glucose level Sit of protein and fat metabolism Removes toxins from the blood

3. Ch. 15 Nutrition & Metabolism Nutrient metabolism Carbohydrates – are primarily catabolized for energy but small amounts are anabolized for glycogenesis (changes glucose to glycogen, occurs in liver cells) Blood glucose – normally between 80 -120 mg/100ml (deciliter); insulin accelerates movement of glucose out of the blood into the cells, decreasing blood glucose and increasing glucose catabolism

4. Ch. 15 Nutrition & Metabolism ATP (adenosinetriphosphate) – molecule in which energy obtained from breakdown of food is stored; serves as direct source of energy for cellular work Fats - catabolized to yield energy and anabolized to for adipose tissue Proteins - primarily anabolized then secondarily catabolized

5. Ch. 15 Nutrition & Metabolism Vitamins & Minerals Vitamins –organic molecules that are needed in small amounts for normal metabolism (Table 15-2) Minerals – inorganic molecules required by the body for normal function

6. Ch. 15 Nutrition & Metabolism Metabolic Rates BMR (basic metabolic rate) – rate of metabolism when a person is lying down but awake and not digesting food and when the environment is comfortably worm. TMR ( total metabolic rate) - the total amounts of energy, in calories, used by the body per day

7. Ch. 15 Nutrition & Metabolism Body Temperature Hypothalamus – regulates the homeostasis of body temperature through a variety of processes Skin – can cool the body by losing heat from the blood through: Radiation Conduction Convection evaporation

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