What might happen when muscles work hard for a long time?
They may have too little oxygen and become fatigued.
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What do muscles use if they are short of oxygen?
Anaerobic respiration.
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What happens when muscles respire anaerobically?
They build up an oxygen debt.
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What happens to glucose in anaerobic respiration?
The glucose is not completely broken down in anaerobic respiration and lactic acid is produced. Less energy is released from the glucose in anaerobic respiration.
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What is a cause of muscle fatigue?
The build up of lactic acid.
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What removes the lactic acid from muscles?
Blood flowing through.
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Why is anaerobic respiration inefficient?
Because the breakdown of glucose is not complete.
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What is a waste product of anaerobic respiration?
Instead of carbon dioxide and water, lactic acid is produced.
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What happens to the lactic acid after exercise has finished?
It must be completely broken down.
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What do you need to break down the lactic acid after exercise has finished?
A lot of oxygen.
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What s the extra oxygen needed to break down the lactic acid after exercise called?
The oxygen debt.
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What does the oxygen eventually do to the lactic acid?
It oxidises the lactic acid into carbon dioxide and water.
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What causes muscles to become fatigued (tired)?
Lactic acid.
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When you stop exercising, what must you get rid of?
Lactic acid build-up.
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When you stop exercising, what do you keep doing to remove lactic acid?
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