Metabolism - Metabolism The energy we use to drive...

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Metabolism The energy we use to drive reactions necessary for life comes from food Cellular respiration o Organic compounds (Carbohydrates, fats, and proteins can all  be consumed as fuel) + Oxygen makes carbon dioxide and  water and ATP and heat o But we don’t eat constantly we’ve adapted mechanisms to store  nutrients and use them as needed o Metabolic Rate Rate at which an organism uses fuel to supply ATP for its  activities and reactions Two phases of metabolism o Absorptive phase: When digested nutrients are absorbed into  blood from gastrointestinal tract Some newly absorbed nutrients are immediately used for  energy o Post-absorptive Phase: The rest is stored for a time when the  body is not absorbing nutrients Most absorbed nutrients pass through the liver Excess Glucose: Stored as glycogen in the liver o Incorporated into triglycerides in adipose tissue Some triglycerides are used in absorptive states Glycerol -> Glucose Excess triglycerides: Lipase removes fatty acids from 
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Metabolism - Metabolism The energy we use to drive...

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