Brainstorm and make a list of foods that give your body energy. Think of different energy needs: working out taking a test playing a sport Nancy Dooley
Organisms maintain a The result of these dynamic responses is called homeostasis, a equilibrium “dynamic equilibrium Organisms have a diversity of that sustains “or “steady state” homeostatic feedback which keeps the mechanisms that detect life internal environment deviations from the normal within certain limits. state and corrective actions to return their systems to the normal range Life is dependent upon availability ofan energy source and Responses to raw materials that change can rangeare used in the basic in complexity from These mechanisms enzyme-controlled simple activation maintain the physical biochemical of a cell chemical and chemical aspects processes of living process to of the internal organisms. elaborate learned environment within behavior narrow limits that are favorable for cell activity. Because they mustorganisms are continually continually Failure of monitor and these control exposed to respond to changes in these mechanismstheir external changes. can result in and internalenvironments disease or even death.
What foods give us the most energy? What type of food item: protein, carbohydrate, fat? Give me an example of a protein? Carbohydrate? Fat? Processed junk food? Choose some food items from the baskets to experiment with. How could we measure the energy supply that comes out of the food? Let me explain a way we can try to do this.
What supplies do we need? Let’s review safety procedures for dealing with fire? Let’sget into our groups, collect supplies, task cards, lab books, lab guides What challenges might we face with this experiment?TECHNOLOGY
Why did you choose the foods you did and why do you think they give our body the most energy? PredictionsPredictions
Anyone ever hear of the Food Pyramid? Fat Protein CarbohydratesHow does our body work to break thesedown? Does anyone remember the word ENZYMES?
Some of your questions Can we change food to make it healthierCan this experiment help us choose for us to eat? (follow up Genetic healthier foods? Engineering) Think Think Think Which foods have the greatest energy What else effects our energy? output? Let’s analyze our data How should we record our data? What might it tell us?
What have we found here?Equations: • Heat calories = Mass of H2O (g) x Change in Temperature of the water (C) x 4.18 J/g C • Kilocalories = Heat calories (cal) / 1000 (cal/Kcal) • Energy yield = Kilocalories (Kcal) / Grams of food (g)
Table 1Measurements Sample 1 Sample 2 Sample 3 Sample 4Food used Marshmallow Bread Carrot MeatMass of empty can (g) 20000g 20000g 20000g 20000gMass of can plus water (g) 65000g 65000g 65000g 65000gMinimum temperature of water (°C) 20.8 C 22.2 C 23 C 22.6 CMaximum temperature of water (°C) 49.6 C 42.1 C 33.9 C 60.2 CInitial mass of food (g) 10000g 10000g 10000g 10000gFinal mass of food (g) 7500g 9000g 5000g 8000gTable 2Calculations Sample 1 Sample 2 Sample 3 Sample 4Mass of water (g) 45000 45000 45000 45000∆t of water (°C) 28.8 19.9 10.9 37.6∆mass of food (g) 2500 1000 5000 2000Energy gained by water (J) 5417280 J 3,743,190 J 490,500 J 1692000 JEnergy content of food (J/g) 2.166912 3.74319 0.410058 3.53628
Living Environment: Lab 16 1. We set up our experiment 2. We burned stuff 3. We measured stuff 4. We wrote down stuff 5. We compared stuff 6. Now we talk about stuff…