iphy 3430 lecture 2

iphy 3430 lecture 2 - Energetics Energy is the ability to...

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Unformatted text preview: Energetics Energy is the ability to produce change or an effect by doing work . Energy comes in several forms: heat, chemical , radiant, etc . 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 --> proteins, fats, and carbohydrates 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 Proteins Complex proteins in diet --->broken down into amino acids---> once absorbed into body 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 Fats (Triacylglycerides) glycerol-plus 3 fatty acids glycerol = 3 carbon molecule H 2-C -O -H H- C - O - H H 2-C - O - H Triacylglycerides H 2-C -O - FA H- C - O - FA H 2-C - O - FA CH -CH -CH -CH- CH- CH -CH -COOH Unsaturated: Fats Triacylglycerides broken down to monoglyceride...
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iphy 3430 lecture 2 - Energetics Energy is the ability to...

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