Explain how and why exercise affects the body.
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What is an oxygen debt?
During exercise, we often carry out some anaerobic respiration, which produces harmful lactic acid.
An oxygen debt is the amount of oxygen required to remove the lactic acid and replace the body's reserves of oxygen.
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Which organ is responsible for removing lactic acid from the bloodstream?
The liver is responsible for removing lactic acid from the bloodstream.
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How would you measure a person's heart rate?
Feel their pulse, and count how many beats there are in 1 minute.
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How would you measure a person's breathing rate?
Watch their chest, and count how many times their chest rises and falls in 1 minute.
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