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Metabolism

Metabolism. Living cells use nutrients in many chemical reactions that provide energy for vital processes and activities. Metabolisms function. Homeostasis: a healthy and relatively constant internal environment Body regulates to avoid dangerous lacks or excesses. Chemical Balance .

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Metabolism

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  1. Metabolism • Living cells use nutrients in many chemical reactions that provide energy for vital processes and activities

  2. Metabolisms function • Homeostasis: a healthy and relatively constant internal environment • Body regulates to avoid dangerous lacks or excesses

  3. Chemical Balance • Body needs the right balance of nutrients and other substances dissolved in the blood and cells • Oxygen • Temperature • Removal of waste products

  4. Energy for Metabolism • During metabolism, energy is both used and produced

  5. Food Sources of Energy • Carbohydrates • Fats • Protein

  6. Metabolic Rate • How fast the chemical process of metabolism takes place

  7. Body temperature • Changes in body temperature • Shiver=increased body heat=relatively constant metabolic rate • Metabolic processes release energy, in hot climates the metabolic rate slows to help cool the body

  8. Body Size • Metabolic rate matches body size

  9. Physical Development and Age • Cells function rapidly in young individuals in order to build the new material needed for development

  10. Body Composition • Lean tissue takes more calories to maintain than other types

  11. Energy Supply • Low energy = slower metabolism

  12. Basal Metabolism • Energy used by a body at rest to maintain automatic, life-supporting processes

  13. Basal Metabolic Rate (BMR) • A measure of heat given off per time unit, usually as Kcalories per hour

  14. Voluntary Activities • Conscious and deliberate actions

  15. Weight-Loss Diets • Very low-kcalorie “crash” diets are not the best way to lose weight

  16. Physical Exercise • Exercise increased metabolism • Toned muscles burn more calories

  17. Metabolic Rate • Calculate your Metabolic Rate • Men: 66+(6.23 X wt in pounds) + (12.7 X ht in inches) – (6.76 X age in years) • Women: 655 + (4.35 X wt in pounds) + (4.7 X ht in inches) – (4.7 X age in years)

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