Anaerobic Respiration Progress Indicators State the word equation

Anaerobic Respiration Progress Indicators: • • State the word equation for anaerobic respiration Describe the differences between aerobic and anaerobic respiration Do Now Activity: State the word equation for photosynthesis

Question… Why can’t muscle cells continuously carry out aerobic respiration? Why do they revert to anaerobic respiration? When you exercise quite hard your heart may not be able to pump oxygenated blood to your respiring cells quickly enough to carry out aerobic respiration. In the mean time, to carry on supplying your body with energy your cells can revert to anaerobic respiration, where glucose is broken down in the absence of oxygen.

Please complete: Why can’t muscle cells continuously carry out aerobic respiration? Why do they revert to anaerobic respiration? Muscle heart oxygen blood breathing energy When you exercise hard, your muscle cells become short of ____. Although your _____ rate and _______ rate may increase, sometimes the ______ cannot supply oxygen fast enough. When this happens ______ from the breakdown of glucose can still be transferred to _______ cells. This is anaerobic respiration.

When you exercise hard, your muscle cells become short of oxygen. Although your heart rate and breathing rate may increase, sometimes the blood cannot supply oxygen fast enough. When this happens energy from the breakdown of glucose can still be transferred to muscle cells. This is anaerobic respiration. Self-assessment

Task: Watch the video and answer the following questions on your worksheet: 1. During which type of exercise do animals usually start to carry out anaerobic respiration? 2. What is the generalised equation for anaerobic respiration? 3. Is more or less energy released during anaerobic respiration? 4. What effect does lactic acid build up have on the muscles? 5. How can lactic acid be cleared from the muscle? 6. What is the word equation for anaerobic respiration in plants? 7. What is the process called? Why is it a useful process? https: //www. youtube. com/watch? v=HZt. XLhm 7 ISA

Self-assessment: 1. During intense exercise animals start to use anaerobic respiration 2. Glucose Lactic Acid + Energy 3. Less energy is released during anaerobic respiration 4. Lactic acid build up in the muscles causes muscle fatigue, eventually this can lead to muscle cramps and the muscle stops working. 5. Lactic acid is cleared from the muscles by an increase in oxygen concentration, replacing the oxygen debt by breathing more deeply. 6. Glucose Ethanol + Carbon Dioxide + Energy 7. This process is called fermentation, it is used to bake break and prove alcohol

Aerobic respiration in other organisms We have just learnt that plant cells respire anaerobically to produce ethanol and carbon dioxide, as well as energy. Other microorganisms, like yeast, form ethanol and carbon dioxide. This is known as fermentation. Yeast is an important microorganism in food production. It is needed to make bread, beer and wine. These products are made using fermentation.

Task: Decide whether the following statements are TRUE or FALSE: Respiration is the process by which cells convert the chemical energy in glucose into chemical energy in ATP. TRUE Breathing is the same as ventilating the lungs and involves the intercostal muscles and the diaphragm. TRUE Aerobic respiration in muscle cells produces lactic acid and carbon dioxide. FALSE Breathing occurs in all cells of the body. FALSE Breathing can be aerobic or anaerobic.

Exam-style questions: 1. Anaerobic respiration occurs in muscle cells and yeast cells. This equation demonstrates what happens in muscle cells: a) How can you tell from this equation that the process is anaerobic? (1 mark) b) Exercise cannot be sustained when anaerobic respiration takes place in muscle cells. Explain why. (2 marks) c) Compare anaerobic respiration in a yeast cell with anaerobic respiration in an animal cell. (3 marks)

Self-assessment: a) No oxygen (is used) b) Muscles become fatigued / stop contracting because not enough energy is transferred c) Yeast produces ethanol but muscles produce lactic acid yeast produces carbon dioxide but muscles do not both release small amounts of energy

Plenary ~ If these are the answers, what could the questions be? 1. 2. 3. 4. 5. Lactic acid Aerobic respiration Mitochondria Yeast cells Glucose