Anaerobic Respiration - Animals WALT: state the differences between aerobic and anaerobic respiration in animals and write out the equations for both STARTER: Fill in the blanks:

Respiration There are two types of respiration: Aerobic – needs oxygen and happens in cells when glucose reacts with oxygen Anaerobic - does not need oxygen. It happens when there is not enough oxygen for aerobic respiration.

Anaerobic Respiration As you exercise faster, your breathing rates and heart rate increase to supply oxygen and remove carbon dioxide faster. But there comes a point when they can’t increase further. If you exercise harder than this, your body needs to get the extra energy. It also provides the sudden burst of energy that you need when you start exercising hard.

Anaerobic respiration is a type of respiration that does not use oxygen. It is used when there is not enough oxygen for aerobic respiration. glucose → lactic acid (+ energy released) This type of respiration may be used when, for example, an animal is being chased by a predator. Aerobic respiration releases more energy per glucose molecule than anaerobic respiration.

Glucose lactic acid + a bit of energy Unlike aerobic respiration, anaerobic respiration is when energy is provided WITHOUT needing _________: Glucose lactic acid + a bit of energy This happens when the body can’t provide oxygen quick enough for __________ respiration to take place. Anaerobic respiration produces energy much _______ than aerobic respiration but only produces 1/20th as much. Lactic acid is also produced, and this can build up in muscles causing ______ and an oxygen ______. This “debt” then needs to be “repaid” by deep breathing to ________ the lactic acid. Word bank – debt, oxygen, fatigue, oxidise, aerobic, quicker 5

Glucose lactic acid + a bit of energy Unlike aerobic respiration, anaerobic respiration is when energy is provided WITHOUT needing oxygen: Glucose lactic acid + a bit of energy This happens when the body can’t provide oxygen quick enough for aerobic respiration to take place. Anaerobic respiration produces energy much quicker than aerobic respiration but only produces 1/20th as much. Lactic acid is also produced, and this can build up in muscles causing fatigue and an oxygen debt. This “debt” then needs to be “repaid” by deep breathing to oxidise the lactic acid. Word bank – debt, oxygen, fatigue, oxidise, aerobic, quicker 6

Now use the internet to answer the following questions Now use the internet to answer the following questions. Your aim is to get the most points

Anaerobic respiration Where does the glucose for respiration come from? (2 points) Write a poem or story to explain aerobic respiration (4 points) Write the word equation for anaerobic respiration in animals (1 point) What are the differences between anaerobic and aerobic respiration? (3 points) Why do we begin to respire anaerobically? (2 marks) Why do we get stitch when we run? (3 points) Anaerobic respiration What is lactic acid (2 points) Where does the oxygen for aerobic respiration come from (2 points) Can you find the word equation for anaerobic respiration in plants and yeast (next lesson)? 2 points.

Check your understanding Exam question: What are the main differences between aerobic and anaerobic respiration (4 marks)

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