Contents Respiration Releasing energy Aerobic respiration Rate of
Contents Respiration Releasing energy Aerobic respiration Rate of respiration Anaerobic respiration Summary activities 1 of 36 © Boardworks Ltd 2004
The rate of respiration Aerobic respiration is a chemical reaction and so has a rate. glucose oxygen carbon dioxide water energy Is the rate of this reaction always the same? Your body requires different amounts of energy depending on how active you are. So the rate of aerobic respiration changes depending on the amount of energy needed. During what type of activities, does the rate of aerobic respiration increase so that more energy can be released? 2 of 36 © Boardworks Ltd 2004
How much energy is needed? When does the body need to release more energy? not very active = low energy requirements very active = high energy requirements During which type of activities is the rate of aerobic respiration higher? 3 of 36 © Boardworks Ltd 2004
Different energy needs These extremely different activities both need energy from aerobic respiration but is the rate of this reaction the same? low energy need = low rate of aerobic respiration high energy need = high rate of aerobic respiration How does the body respond to these different rates of aerobic respiration? 4 of 36 © Boardworks Ltd 2004
The body’s response to low energy needs During sleep, the body’s energy needs are low and so the rate of aerobic respiration is slow but steady. How does this affect the amount of glucose and oxygen needed? low energy need low rate of aerobic respiration low demand for glucose and oxygen slow heart and breathing rates How does this affect the heart rate and breathing rate? Under these resting conditions, the body has plenty of time to inhale oxygen and the blood is able to supply enough glucose and oxygen to the body’s cells. 5 of 36 © Boardworks Ltd 2004
The body’s response to high energy needs During running, the body’s energy needs are high and so the rate of respiration increases to meet this demand. How does this affect the amount of glucose and oxygen needed? high energy need high rate of aerobic respiration high demand for glucose and oxygen fast heart and breathing rates How does this affect the heart rate and breathing rate? Under these tougher conditions, the body has to work hard to supply enough glucose and oxygen to the body’s cells for aerobic respiration to produce enough energy. 6 of 36 © Boardworks Ltd 2004
Tasks • Using the power point list the differences in your body between low energy and high energy activities. 7 of 36 © Boardworks Ltd 2004
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