Incubate the yeast in a water bath. 4.4.2.2 Response to During exercise the human 1 Describe the changes in the Investigate the effect of exercise body reacts to the increased body during and after exercise on the heart rate. demand for energy. exercise. Measure breathing and pulse Draw a cartoon strip to show rates before and after The heart rate, breathing rate the journey of an oxygen vigorous exercise. and breath volume increase molecule from air through during exercise to supply the organs and blood to cell and Use plasticine to model the muscles with more mitochondrion with subsequent molecule for lactic acid oxygenated blood. This is release of energy. C3H6O3. needed for the increased cellular respiration to transfer Describe oxygen debt and how Determine that if 6 oxygen more energy to meet the it is repaid through vigour are added, the resulting demand. If insufficient oxygen breathing. products are 3 lots of carbon is supplied anaerobic dioxide (CO2) and water respiration takes place in (H2O). muscles. The incomplete oxidation of glucose causes a build-up of lactic acid and creates an oxygen debt. During long periods of vigorous activity muscles become fatigued and stop contracting efficiently. One cause of muscle fatigue is the build-up of acid in the muscles. The oxygen debt must be once ‘repaid’ exercise stops causing deep breathing for some time.
Incubate the yeast in a water bath. 4.4.2.2 Response to exercise During exercise the human body reacts to the increased demand for energy. The heart rate, breathing rate and breath volume increase during exercise to supply the muscles with more oxygenated blood. This is needed for the increased cellular respiration to transfer more energy to meet the demand. If insufficient oxygen is supplied anaerobic respiration takes place in muscles. The incomplete oxidation of glucose causes a build-up of lactic acid and creates an oxygen debt. During long periods of vigorous activity muscles become fatigued and stop contracting efficiently. One cause of muscle fatigue is the build-up of acid in the muscles. The oxygen debt must be ‘repaid’ once exercise stops causing deep breathing for some time. 1 Describe the changes in the body during and after exercise. Draw a cartoon strip to show the journey of an oxygen molecule from air through organs and blood to cell and mitochondrion with subsequent release of energy. Describe oxygen debt and how it is repaid through vigour breathing. Investigate the effect of exercise on the heart rate. Measure breathing and pulse rates before and after vigorous exercise. Use plasticine to model the molecule for lactic acid C3H6O3. Determine that if 6 oxygen are added, the resulting products are 3 lots of carbon dioxide (CO2) and water (H2O).
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