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Lesson 2.2 Cellular Respiration Reading 1 What Happens During Cellular Respiration (pgs 50-53) Getting Energy – use the picture below to answer the 2 questions 1. Infer – color in the last three energy scales to show how the hiker’s energy changes Low High Low High Low High Low High 2. How do you think the hiker’s breathing rate changes as she climbs? It is faster as she climbs and slower when she rests. Summarize Cellular Respiration releases Energy from Food uses Oxygen you get from Breathing Cellular Respiration Equation C6H12O6 glucose + 6 O2 oxygen 6 CO2 + carbon dioxide 6 H 2O + water ENERGY Figure 2 Releasing Energy Stage 1. In the cytoplasm, glucose is broken down into smaller molecules, releasing a small amount of energy. Stage 2. In the mitochondria, the smaller molecules react, producing carbon dioxide, water and large amounts of energy. Comparing Two Energy Processes Energy Photosynthesis (green plant) Glucose + Oxygen Water + Carbon dioxide Energy (bunny + plant) Cellular Respiration Assess Your Understanding 1a. How does Stage 2 of cellular respiration benefit a cell? Stage 2 releases a LARGE amount of energy that the cell can use. 1b. Why does cellular respiration add carbon dioxide to the atmosphere, but photosynthesis does not? Cellular respiration gives off carbon dioxide; photosynthesis uses carbon dioxide to make glucose. I get it! Now I know that during cellular respiration, cells break down food, using oxygen and releasing energy. I need extra help with… Reading 2 What Happens During Fermentation (pgs 54-55) Apply It 1. How does the fermentation that causes dough to rise differ from fermentation in muscles? Fermentation in dough produces carbon dioxide and alcohol. Fermentation in muscles produces lactic acid. 2. How would you show that yeast was responsible for making the dough rise? Mix the dough with all the same ingredients, but leave out the yeast. Energy for Life Producers Plant cells capture energy by way of (photosynthesis, fermentation/cellular respiration). Plants are autotrophs because they make their own food. Plant cells release energy for cell functions by way of (photosynthesis, fermentation/cellular respiration). Plants get this energy when oxygen reacts with sugars made in photosynthesis. Consumers A runner on an easy jog through the woods gets energy by way of (photosynthesis/fermentation, cellular respiration). The runner is a heterotroph because she gets energy from food that she eats. If the runner makes a long, fast push to the finish, her muscle cells may get energy by way of (photosynthesis/fermentation, cellular respiration). This process releases less energy and does not use oxygen. Assess Your Understanding 2a. When a race ends, why do you think runners continue to breath quickly and deeply for a few minutes? To replace oxygen that was used up by the muscle cells. 2b. How do living things get energy? (Sample) Living things get energy from food that is either made (autotrophs, producers) or eaten (heterotrophs, consumers). Organisms break down food through cellular respiration, releasing energy for cell use.