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iphy 3430 1-13-11 - IPHY 3430 If you missed class on...

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1/9/11 1 IPHY 3430 1-11-11 If you missed class on Tuesday, please pick up a syllabus from Dr. Carey Clicker question: What are your future plans? A. med school B. dental school C. physical therapy D. nursing E. other Energetics Energy is the ability to produce change or an effect by doing work. Energy comes in several forms: heat, chemical, radiant, etc.
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1/9/11 2 What is work in a human system? 1. Synthesis of macromolecules 2. Maintenance of ionic disequilibria 3. Muscle contraction 4. Transmission of information 5. Many others Chemical energy is the only form of energy that can be used to work in the human body. Bonds between C, H, N, S, O, etc. contain energy. Heat energy cannot be used to do work in the human body. Where does energy for use in the human body come from? Chemical energy in food (carbohydrates, proteins, and fats)
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1/9/11 3
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1/9/11 4 Carbohydrates complex carbohydrates (glycogen, starch) --> simple sugars (glucose, galactose, fructose) ---> once absorbed into the body can be stored temporarily as glycogen or immediately catabolized -->energy released by enzymatic breakage of bonds ---> some work done and the rest lost as heat
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1/9/11 5 Proteins Complex proteins in diet --->broken down to amino acids---> once absorbed into body, amino acids can be used temporarily to make new proteins or immediately catabolized---> energy released by enzymatic breakage of bonds--> some work done and the rest lost as heat
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1/9/11 6 Fats Triglycerides broken down to monoglyceride and two fatty acids-->
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